Are you a starter but not a finisher? Or do you generally finish what you start and just want to do these things?
Starters who don’t finish are very common and some of them do have ADHD, but probably not most. It’s fun and exciting to start things and difficult to finish.
But if you don’t have this problem then you’re probably just curious to learn new things - a good problem to have.
I’d maybe consider how you can do 2 or more of these things at once - for example, weld while building a tiny house and make fake rock on the side while you’re messing with cement.
Then tackle others on weekends (sail) or nights (paint). I bet you can get pretty far down your list pretty fast if money is not the issue.