Stop thinking and planning. Who needs your help, what do they need your help with, and how do they do that now?
Find people that fit your target customer segment, build a list of them, and ask them to talk with you.
Ask people to tell you stories about real things that they've done. What did they do, how and why did they do it, and what problems did they have doing it?
Not all problems need a solution. Not all solutions can become a business. You need data to see which paths are worth another step.
If your original idea solves a viable problem, keep going. If you find a bigger problem, solve that one instead. Don't like doing this? Stop and move onto something you do.
Make an MVP? Do it after. Register a legal entity? After. Fill out a Lean Canvas? After. Everything else comes next if you can find a problem that needs a solution.