Only things that have made a measurable impact for me - marketing is sales:
1. Mom Test - https://www.momtestbook.com/
2. Do more sales calls + customer interviews. Then rewatch the call and debug what you're doing, saying. What is landing and not landing. I miss the majority of the signal while I'm on the call - I don't actually get anything from it until I rewatch/see how people react to different things I say.
3. Rinse, iterate, and repeat. Your goal is to solve a customer problem. How you describe it, market it, etc. depends on how a customer describes the problem, where they spend their time, when and how they find solutions to their problem.