You're still young, so I'm guessing you don't like saying no, perhaps because you need the money. But the longer you're doing this, the easier it will get to sa

You're still young, so I'm guessing you don't like saying no, perhaps because you need the money. But the longer you're doing this, the easier it will get to say, "well, actually, no, I only do X" and in fact get paid more than a generalist, and be in higher demand than a generalist, because people like paying for experts. That's not an answer to your immediate predicament, but it does pay to think where you want to be a couple of years from now and how to start moving in that direction.