“My way of doing things is just to actually build a product, or at least an MVP for it, and then share it to as many people as I can and get instant feedback from the users.”

Ship the MVP and let users guide the iteration — talking to people is the real roadmap

The fastest way to validate is to build a small MVP and put it in front of as many people as possible to get instant feedback. Focusing on a project for a short, finite amount of time forces clarity on whether it's actually valuable — and talking to users is how the real feature list gets built.