I would suggest coming back, as @ShadowDan said there is plenty of new content, especially at end game. Here's my advice, because I did sort of the same thing and am on a small hiatus atm. Don't over play, if you get ticked, take a break, play ACIV or something . Also, mix it up, I got very tired of just trying to get the best and do everything for one job, however fell in love with it again when I lvl'd BRD up and BTN and CUL, now I have much more to keep me entertained and to think about while gaming.