Short answer: Most of the time, an underperforming marketing agency isn't the actual problem. The agency is executing tactics inside a growth system (a CRM, a sales handoff, a strategy) that was never built to convert good marketing work into consistent results. Fix the agency, and nothing changes, because the agency was never the broken part.
That's the direct answer. Here's the longer, truer version, because "fire the agency and hire a better one" is advice that's failed enough founders that it's worth slowing down on.
You've hired good agencies. Talented people, real experience, decent case studies, a proposal that made sense. Six months in, you're busy: reporting calls, campaign launches, a content calendar that actually gets filled. And you're right back where you started. Revenue is flat. The pipeline still feels thin. Leadership is starting to ask what, exactly, the marketing spend is buying.
The instinct at this point is to blame the agency. Sometimes that's fair. There are genuinely bad agencies, and genuinely mismatched ones. But in founder-led companies between $3M and $30M, the pattern I see most often isn't a bad agency. It's a good agency, executing competently, inside a system that can't convert their work into compounding results no matter how well they do their job.
That distinction matters, because it changes what "fixing it" actually requires.
An agency executes tactics. Landing pages, paid campaigns, content calendars, email sequences, a rebrand if that's in scope. What an agency almost never has the mandate or the internal access to fix is the growth system sitting underneath all of that work.
Three specific gaps show up constantly:
The CRM doesn't talk to the website. Leads come in through a form, and there's no clean, automatic path from "form submission" to "sales follow-up." Someone has to notice, export, forward, remind. Every manual step is a place a lead goes cold.
Nobody owns the handoff between marketing and sales. Marketing generates a lead, hands it off, and has no visibility into what happens next. Sales gets a name and an email with no context about what the person actually cared about. Both sides are doing their job. The handoff between them is the part nobody's job includes.
Strategy lives only in the founder's head. The agency gets a kickoff call, a few Slack messages, maybe a one-page brief. What they don't get is the actual reasoning behind who the business serves, why, and what "working" looks like six months out, because that reasoning was never written down anywhere they could reference it.
Put a great agency on top of any one of these gaps, and their work will still underperform. Not because the campaigns were poorly built. Because the system the campaigns are running through can't hold onto the value they create.
It gets misdiagnosed because the symptoms of an agency problem and a system problem look identical from a leadership seat. Both show up as: leads aren't converting, growth has stalled, the reporting looks fine but the bank account doesn't reflect it.
So the natural move is to change the variable that's easiest to change: swap the agency, try a different tactic, chase a new channel. Meanwhile the actual constraint, the system underneath, stays exactly the same. Six months later, the new agency produces a strikingly similar result to the old one, for a reason that has nothing to do with either agency's talent.
I've watched founders go through two, sometimes three agencies this way before anyone asks the harder question: if I handed this exact team a fully connected system (clear positioning already documented, a working handoff to sales, a CRM everyone on the team actually trusts and uses), would their work compound? If the honest answer is no, the agency was never going to be able to fix it on their own, no matter how many more of them you hire.
Before evaluating (or replacing) an agency again, these three questions tend to surface which kind of problem you actually have:
None of these questions are about the agency's skill. All three are about whether the business has the infrastructure to receive what a skilled agency produces.
If you're not sure how you'd answer any of these three, that's usually the tell. The Growth Systems Map is a free self-assessment built to answer exactly this: whether the gap in your results is coming from execution, or from something structural underneath it. It takes about 10 minutes and gives you a picture of your own system before you spend another dollar deciding what to change next.
It's worth naming plainly: pushing harder on a disconnected system (more ad spend, more content, more outbound) produces the same broken results, just faster and more expensively. It feels like progress because there's more activity. It isn't progress if none of that activity is compounding.
The businesses that actually see marketing work aren't the ones with the most aggressive campaigns. They're the ones where the infrastructure underneath (the CRM, the handoff, the documented strategy) was built to hold the weight of the marketing running through it. Everything an agency does after that point has somewhere to go.
This isn't an argument against hiring agencies, and it isn't a case for doing everything in-house. It's a case for sequencing the work correctly. If the system underneath is broken, the highest-leverage move isn't a better campaign. It's fixing what the campaign has to run through to reach a customer. Once that's true, even an average agency's work starts to compound. Before that's true, even an excellent one's won't.
The fastest way to find out which one you're dealing with isn't another agency conversation. It's mapping your own growth system first. Get your free Growth Systems Map and see where your system is working, and where it's quietly leaking, before you make the next call.
About Marketing Monsoon Marketing Monsoon, LLC is a growth marketing agency and HubSpot Solutions Partner helping founder-led businesses ($3M-$30M) build the growth infrastructure that aligns marketing, sales, and revenue into one working system. Founded by Jayne Burch, Marketing Monsoon uses its proprietary Growth Engine Diagnostic and the Momentum Hub membership to help CEOs move from scattered tactics to a connected system built for sustainable, compounding growth. Learn more at marketingmonsoon.com.