Some categories have buyers who are reachable through the usual apparatus. They search, they click, they download a report, they enter a funnel, they eventually convert, and the whole machine is measurable end to end.
Then there are the categories where none of that happens. Public agencies. Regulated industries. Deeply technical infrastructure. The buyer doesn't search for your category, does not download reports, doesn't attend your webinar, and will not respond to a sequence no matter how well written.
I work in one of these now and I ran an independent publication serving another for years. What follows is what actually moves the needle when the standard playbook doesn't apply, and why.
Why the funnel does not exist there
Three structural reasons, and they compound.
The purchase isn't initiated by a person browsing. It's initiated by an obligation. A regulation, a grant cycle, a mandate, an incident. Nobody in that world wakes up curious about your category. They wake up with a requirement and a deadline, and they need someone who has done it before.
The buying group is large and mostly invisible. The person you can reach is rarely the person who decides, and the people who decide are unreachable through any channel you can buy. Your material has to survive being forwarded to someone you will never meet, stripped of context.
Risk dominates upside. In most commercial buying, a good outcome and a bad outcome are roughly symmetric. In public and regulated buying they aren't. Nobody gets promoted for choosing well. People do get blamed for choosing badly. Every message optimized for excitement is aimed at a motivation the buyer doesn't have.
That last one invalidates most of what marketing is trained to do. Enthusiasm is not just ineffective there, it is a negative signal.
What works instead
Publish the thing that makes their job easier, with no gate. Not a lead magnet. An actual reference document: how a standard works in practice, what the common implementation failures are, a comparison of approaches that doesn't conclude with you. Gating it defeats the purpose, because the value is in being the document that circulates internally, and a form kills circulation.
I've watched a single well-made reference document do more than a year of campaign work in this kind of market, because it ends up attached to an internal email at an organization you had never heard of.
Be findable by problem, not by category. Your buyer does not search your category name. They search the specific error, the regulation number, the failure they're staring at. Content organized around your product taxonomy is invisible to them. Content organized around their symptoms isn't.
Show your work on something unglamorous. In risk-dominated buying, evidence of competence beats evidence of vision every time. Publishing a detailed account of how you actually handled a difficult, boring implementation detail is more persuasive than any claim about outcomes, because it's the kind of thing only someone who did it could write.
Earn trade coverage rather than buying attention. In these sectors, the trade press is small and it's read. Coverage there carries weight that no amount of paid placement does, and the way to get it is to be genuinely useful to the publication first: answer their questions, correct their errors, offer the account of what went wrong. That's slow and it's why it works.
The measurement problem, honestly
You won't be able to attribute most of this, and pretending otherwise leads to killing the things that work.
The reference document that circulated internally at an agency for eight months before someone contacted you will attribute to a direct visit. The trade article that made a skeptical stakeholder comfortable will attribute to nothing at all. Cycles are long, the buying group is invisible, and last-touch attribution in this market is close to meaningless.
The measure I would use instead is qualitative and it works: in inbound conversations, what do people already know about you before the first call? Track it as text, not as a number. When prospects start arriving having already read the same specific thing, that thing is working, and you learned it without a model that couldn't have seen it anyway.
The mindset shift
The usual framing is that you're competing for attention. In these categories you aren't, because the attention isn't available at any price. You are competing to be the obvious choice at the moment an obligation forces a decision that may be months away.
That changes what you invest in. Reach matters less. Being correct, findable, and unembarrassing to recommend matters more. The asset is not a campaign, it's a body of work that makes you the safe answer when someone internal asks who does this.
It's slower than the standard playbook and it is more durable, because the thing you built cannot be outspent. A competitor can buy more impressions than you tomorrow. They can't quickly become the reference everyone in the sector already has open in a tab.