If your agency lost its biggest client this month, the most useful thing you can do in the next two weeks is to put a campaign in front of companies that look like your best past clients, and then answer the replies every day. This plan shows the owner of a 5 to 30 person agency how to do that from Claude or ChatGPT: one audience sentence, a criteria check, a preview of real prospects, a value offer taken from real delivery work, a launch, and a daily reply routine with a playbook.
It is a plan for your agency’s own new business. It does not cover outreach that you run for clients.
The plan uses the GTM Bud connector, which lets your own AI assistant build and run a LinkedIn campaign in GTM Bud while you approve each step. The time figures below are our estimates for a first run, not measured numbers.
Why do the first two weeks matter more than the notice period?
Because outreach sent in week one can turn into calls while the client still pays, and outreach sent in week six cannot. The notice period feels like time. It is really a countdown on the only weeks in which you can look for work without a hole in the revenue.
Most owners spend those weeks on three things that feel productive and are not new business:
- Trying to win the client back. Worth one honest conversation. Not worth two weeks.
- Rewriting the website. Nobody new sees it until something brings them there.
- Asking the same referral partners again. They already send you what they have.
None of these puts your agency in front of a company that has never heard of you. That is the job of this plan.
The two week plan at a glance
| Days | Job | What you ask your AI | Time you need |
|---|---|---|---|
| 1 | Find the pattern in best clients | Turn three client descriptions into one audience sentence | About 45 minutes |
| 2 | Check the criteria | Create a campaign draft and read the criteria check | About 30 minutes |
| 3 | Look at real people | Preview prospects, mark Good fit or Not a fit | About 30 minutes |
| 4 | Write the offer | Write value offers from real delivery work | About one hour |
| 5 | Launch | Write the sequence, run the readiness check, confirm the preview | About one hour |
| 6 to 14 | Answer replies | Label replies and write answers with the playbook, every workday | 15 to 20 minutes |
Before day 1, add the connector and connect your LinkedIn account. The steps are on GTM Bud for Claude. GTM Bud focuses on Sales Navigator accounts. The 14-day free trial starts when you launch your first campaign.
Day 1: How do you turn your best past clients into one audience sentence?
An audience sentence is one plain sentence that names the role, the type of company, the size and the region of the people you want to reach. Build it from the clients you would most like to have again, not from the client that just left.
Start with a list, not with a sentence. Write three to five past clients that were profitable, pleasant, and stayed. For each one, note the title of the person who signed, the kind of company, the number of employees, and the country. Then give the list to your AI:
“Here are my five best past clients with the buyer title, company type, size and country for each. Tell me what four of the five have in common, and write one audience sentence from it.”
An example. A nine person content marketing agency lost a client that made up a third of its revenue. Its best past clients were four software companies that sell to finance teams, each with 60 to 250 employees, and in each case the buyer led marketing. The sentence became:
“Heads of marketing at B2B fintech software companies with 50 to 300 employees in the US and the UK.”
One warning. If your biggest client was nothing like the other four, do not put it in the list. Its departure is a reason to look for clients that are a better fit, and a second copy of it is a second concentration risk. For a deeper method, see our guide on how to build an ICP for outbound.
Day 2: What does the criteria check tell you?
The criteria check tells you which parts of your audience cannot be read from a LinkedIn profile, a company page or public web content, and it suggests a rewrite for each one. Your AI writes the criteria from your sentence, and GTM Bud checks them. You see the problem before a single prospect is found, which is cheaper than finding it in the replies.
Ask your AI: “Create a campaign draft from that audience sentence and show me the criteria check.”
For the fintech sentence, the check passed size and region and flagged nothing as unverifiable. The AI then raised two points of its own:
- A title to decide. “Heads of marketing” can mean a CMO, a VP Marketing or a Director of Marketing. The owner chose VP and Director, because a CMO at 300 people rarely buys content directly.
- A wider match than intended. “Fintech” also matches banks, lenders and payment processors. The agency writes for software buyers, so the sentence became “software companies that sell to finance teams or to banks, not banks or lenders themselves”.
Trade-off: A narrow sentence finds fewer people and better ones. A wide sentence fills the campaign faster and fills your reply list with companies that you would decline. With a revenue gap, wide is tempting. Narrow is the choice that saves your reviewing time in week two.
Day 3: How do you read a prospect preview?
A prospect preview is a set of real people who match the campaign, shown before launch, and you mark each one Good fit or Not a fit. Read it as a test of your sentence, not as a lead list.
Ask: “Start a prospect preview for the draft and show me who matches.”
Two results from the example:
- Hannah K., VP Marketing at a spend management software company with about 120 employees in Austin. Marked Good fit: she owns the content budget, and the product is sold to finance teams.
- Luca M., Marketing Director at a retail bank with about 2,000 employees in Leeds. Marked Not a fit: a bank and not a software company, and far above the size range.
When a Not a fit appears, ask why it matched. Luca matched because the first sentence said only “fintech”. The mark, and the corrected sentence, are how the campaign learns what you meant. If more than a few previewed people are Not a fit, change the targeting and preview again before you go to day 4.
Day 4: Which value offer can an agency honestly make?
A value offer is the specific, useful thing that you offer a stranger in the first message, and for an agency the honest ones come from work that your team already does in the first week with a new client. If you have to invent a new deliverable for the offer, you will not have time to deliver it when ten people say yes.
Look at your own onboarding. Almost every agency has a first week artifact:
| Agency type | First week work you already do | Value offer it becomes |
|---|---|---|
| Content | Competitor content audit | A map of ten buyer questions that competitors answer and you do not |
| Paid media | Account structure review | A one page list of the three largest sources of wasted spend |
| Design | Brand consistency review | Five screens where the brand breaks, with a corrected version of one |
| Development | Performance and checkout review | A recorded teardown of the slowest step in the purchase path |
The content agency in the example chose the first row. Its offer was: “A content gap map for your product: ten questions your buyers ask that three of your competitors answer and you do not, with a brief for the first article.”
Ask your AI: “Read my website and my LinkedIn profile and set the seller profile of this campaign. Then write three value offers for this campaign. Each one must be a deliverable from our onboarding week.” GTM Bud gives its instructions for value offers, your AI researches and writes, and GTM Bud checks and saves the result. The same audit-first idea, done by hand, is in our article on how to get clients for a marketing agency.
Do not offer a “free strategy session”. It costs you an hour for each yes, and the lead cannot tell it apart from a sales call.
Day 5: What happens before the campaign launches?
Three things happen: your AI writes the message sequence, GTM Bud lists what is missing for launch, and you confirm a preview. The campaign does not start until that confirmation.
- Ask: “Write the message sequence for this campaign with the first value offer.” GTM Bud gives its instructions, the AI writes, and GTM Bud checks and saves the sequence. Read every message. Remove any sentence that you would not say on a call.
- Ask: “Run the launch readiness check.” A common missing item is the sending account, which you choose on gtmbud.com. The sending schedule is set there too.
- Ask: “Show me the launch preview.” It shows the first message of each channel. Confirm it when it is correct.
The 14-day free trial starts when you launch your first campaign, so it starts with this launch.
Days 6 to 14: What is the daily reply routine?
The daily routine is 15 to 20 minutes on each workday: label the new replies, let your AI write answers with your playbook, and approve or edit each one. Daily matters here because an interested lead who waits four days has usually moved on.
First, write the playbook. A reply playbook is a short set of rules that your AI follows each time it writes an answer. For an agency that just lost a client, these five rules cover most replies:
- Goal. Every answer to an Interested lead offers a 25 minute call with the owner.
- Budget questions. No number in chat. Say that scope decides the price and offer the call.
- “We have an agency.” Do not criticize it. Ask what they would hand to a second partner if they could.
- Do not show the gap. Never say that you have capacity because a client left.
- Length. Three sentences or fewer.
Rule 4 is the one that this situation adds. Urgency reads as weakness to a buyer.
Then run the routine. Ask: “Read the new lead replies, label each one Interested, Warm or Not interested, and write answers for the Interested ones with the account playbook. Show me each one.”
One example. Hannah wrote: “We have two writers in-house. Not sure we need an agency.” The AI wrote:
“Two writers is a good base, Hannah. The gap map shows which buyer questions they have not reached yet, and you can give it straight to them. Want me to send it, with or without a call after?”
The owner approved it without a change, and the AI sent that exact text. Your AI shows each reply for review, and GTM Bud instructs it to send only after you approve the exact text, up to 40 replies a day for each LinkedIn account. For the wording of harder cases, use our guide on how to handle cold outreach replies.
On day 14, ask the results question: “Give me the results for this campaign with the as-of time. How many replies are Interested, how many are Warm, and what did the Not interested leads say?” The last part is the most useful. If most of them say the same thing, change the sentence or the offer.
Three objections owners raise in the week of the notice
“I should spend this time on the people who already know us.” Do that too, and do it first: one note to each past client and each lapsed proposal takes an afternoon. But that list has an end, and you reach it in a day. The campaign is for the day after, when the people who know you have all said “not right now”.
“Cold outreach will make us look desperate.” It can, if the message says that you have capacity. It does not if the message offers one specific deliverable to a company that fits. Rule 4 of the playbook exists for this reason. You read the messages before launch, and your AI shows you each reply before it sends, so you can remove anything that sounds desperate.
“Two weeks of this will not pay next month’s salaries.” Correct. This plan gives you no revenue number and no number of calls, because both depend on your audience and your offer. What it gives you by day 14 is evidence: who answered, what they asked, and which objection came up most. Make the cash decisions with your accountant, and make them with that evidence on the table.
What this plan does not do
It does not replace the lost revenue in two weeks. It starts conversations, and conversations become signed work on the buyer’s schedule. It does not take a list upload through the connector, so the lapsed proposals in your inbox need a personal note from you. It does not launch a campaign until you confirm a preview. And it does not run itself after day 14: the smallest version of the ongoing work is the routine in agency new business in one hour a week.
Frequently asked questions about losing your biggest agency client
How long does it take an agency to replace a big client?
Longer than the notice period in most cases, which is why the plan starts in week one. Outreach has to find people, start conversations, lead to calls and then to a proposal. Nobody can give you an honest number of weeks for your agency. What you control is the date on which the first messages go out.
Should I cut staff as soon as the biggest client gives notice?
That is a finance decision, and this plan does not make it for you. What the plan changes is the information you have. After two weeks you know if your audience answers and what they ask, which is better evidence for a staffing decision than a guess made on the day of the notice.
Should an agency lower its prices to win work fast after losing a client?
Usually no. A discount fills the gap with work that pays less and takes the same team hours, and the lower price becomes the reference for the next renewal. A small, fixed first project at your normal rate is a better way to make a fast yes easy.
Can I contact the other clients of the company that left?
Check your contract first. Many agency agreements limit contact with the people and partners of a client. Outreach to new companies that look like your best clients has no such limit, and it is the part of the plan that you can start today.
Do I need a salesperson to run this plan?
No. The plan is written for an owner who sells. Your AI prepares the campaign and writes the replies, and you approve each step. The calls with interested leads stay with you, and no tool takes those. The page on AI LinkedIn outreach for agency owners shows the full setup.
Start in the notice period, not after it
When an agency lost its biggest client, the owners who recover fastest are the ones who use the paid weeks to start new conversations. Write one audience sentence from your best past clients, test it with the criteria check and the preview, offer a deliverable that you already make, launch, and answer replies every workday with a playbook. Add the connector with the steps on GTM Bud for Claude, then see the whole model on AI LinkedIn outreach for agency owners.