What is the History of the Cather's for your school? Does the Coach always keep one to sit the bench? Do they get a set amount of games to play in?
My Son's situation is somewhat different. He gets to play in the field but is still available if needed as a Catcher.
I would suggest you talk to the Coach just to see what he envisions for you. I would NOT ask to go back to JV. But maybe you can get some play time elsewhere. Are you a really good hitter? That is what gets my son time in the field. If not work on that. Maybe if nothing else you go be a DH at times.
Hopes this helps some. My Son always trys to talk to the Coaches to find out what his role for the team will be. They like to know that a kid cares. But... it is how you approach them and the issue that counts.