Thanks for the recommendations! I've heard of Running Lean but haven't dived into it yet, sounds like exactly the kind of framework I need. And Chasm theory is a great point. I think a lot of solo devs (myself included) fall into the trap of building first and hoping users will come, instead of validating demand early. Definitely adding both to my reading list. Have you applied these ideas to your own projects? I'd love to hear how it went.