If you're hankerin' to play the game again, play the game again. Don't set some rule for yourself that there has to be x amount of new content. It will be a new world, you can start with a new character, and you will create novelty.

But if the urge isn't that strong, maybe you haven't been away from the game long enough, and there are plenty of other games. See you when you get back, maybe after Mistlands.