However, if you ask me to pick one specific project, I get overwhelmed because I don’t know what’s reasonable.

I don’t know enough to know if my ideas are achievable, or if I’d just be bashing my head against the wall. I don’t know if they’re laughably simple tasks, multimillion-dollar propositions, or Goldilocks ideas that would be perfect to learn a coding language.

List out some ideas you're thinking of. While it may not be obvious to you, someone who is seasoned (me or someone else) might notice at least a general theme or idea to point you in the right direction for where you should go and what you should learn, regardless of if the projects are reasonable.

Note - Most projects take teams to realize, so if your ideas are too large, they might not generally be feasible alone.