That's a tight spot to be in, but should open up some trade possibilities. First, I'd try to hang onto Young if you can because he's the one guy here that should certainly get other eligibility (3B) right after the season starts.
Otherwise, like you said, the obvious thing to do is deal Votto for a stud somewhere else. If you can get a similar 2B or catcher to Votto, that would be ideal. I'd be touching base with Pedroia and Cano's owners, for starters. Good luck.