“Useful” is negatively correlated with “Correct theory”… on a grand scale.
Sure, having a correct theory has some positive correlation with “useful”,
Which is it?
I think all the further you can go with this line of thought is to point out that lots of things are useful even if we don’t have a correct theory for how they work. We have other ways to guess that something might be useful and worth trying.
Having a correct theory is always nice, but I don’t see that our choice here is between having a correct theory or not having one.
Well, if we really wanted to other-optimize we’d try to change your outlook on life, but I’m sure you get a lot of such advice already.
One thing you could try is making websites to sell advertising and maybe amazon clickthroughs. You would have to learn some new skills and have a little bit of discipline (and have some ideas about what might be popular). You could always start with the games you are interested in.
There’s plenty of information out there about doing this. It will take a while to build up the income, and you may not be motivated enough to learn what you need to do to succeed.