B2B SaaS Growth Marketer: find & build our first repeatable acquisition lever

We make a B2B SaaS product, an intelligence and attribution layer for companies that run LinkedIn ads. It's live, we have more than a hundred paying customers, and almost 40% people who start a trial end up paying. The product is not our problem. The top of the funnel is. Not enough of the right people reach a trial, and I honestly haven't worked out yet what moves that number. It might be the website, the message, a free tool, the audience we go after, or a channel we haven't tried. I want one experienced person to figure that out with data/experience, take it over, and fix it, then turn it into something we can scale. This is a find-and-build job, not a tune-an-existing-machine one. If you need a working funnel to optimize, this won't be a fit. You would run small fast experiments and pull in contractors (if necessary) for the craft work (CRO, copy, design) while you own the number, the budget, and the weekly read on what is actually working. What I care about: you have taken at least one acquisition channel from near zero to repeatable yourself, and you can show me the numbers behind it, a result you drove and not one you "contributed to." You read data and form your own hypotheses. You are fine working when nobody can tell you where the answer is. You know B2B, LinkedIn ads, or demand gen well enough to market to other marketers. Hours are flexible. Part-time or full-time, whatever fits the right person. We would start with a short paid task on our real funnel, then move to an ongoing contract that grows as you prove a lever. To apply - tell me one channel you built from near zero to repeatable, with the numbers. And tell me this: our trial-to-paid is strong, around 40 percent, but too few visitors start a trial in the first place. What are the first three things you would measure to find out why?