> My point is: it's very, very, very hard to do this, especially with my set of interests

It is very, very, very hard because you're making it hard by insisting on finding a strong intersection with your set of interests.

Half the jobs I've had aligned well with my interests. They were also in the lower half of jobs I liked. The best jobs I've had were the boring ones. It turns out, there's a lot more to jobs than just what you work on.

The most important thing is to keep a roof over your head. Next is saving for retirement. And then there are things like work environment, the people you work with, team dynamics, the actual technical work, etc.

I've found that the most intellectually fun/challenging work was usually coupled with the most dysfunctional teams. It's likely just a coincidence, but it was a good lesson that other things matter at least as much.