Well, you can either find some other way to play, like spending time in PvP if you've been mostly PvE. You could try rolling a new team on another server or the other faction. You could just quit for a while and try another game, either solo or boxed. You can even pick up a F2P game to do that. Or you could quit gaming altogether for a while.

I haven't played since February. I'm taking advantage of free time from Blizzard to screw around for a bit, but I probably won't subscribe again until September or October. Your toons aren't going anywhere. Nothing wrong with taking a break and coming back later. Or moving on to something else.