I know what this is like. I enjoy doing all sorts, drawing comics, illustration, animation, writing. And because of this my portfolios are lacking. (I'm rectifying that now though).
So I guess on the one hand is your skills and what you enjoy. I think what others have said about animation skills transferring to illustration being true. Keep upping your skills in art and you'll become a better artist which will help in whatever you do.
On the other hand is earning money. This comes down to how you present yourself and the service you offer to the world. That's where your portfolio(s) come in. It might seem like short changing yourself, but the best thing to do to get work is to present only one thing at a time - very specifically, and then market it. There's work in every field, and every field is competitive. So this has to come down to the kind of work you want to do.
The last thing to say is, you don't have to do just one thing. I'm doing web/app development on the side and stock trading to make the bills for example. Last year I did fan art commissions and this year I might do my first children's book! It's all evolving and changing. Hope this helps