I've already played through as another character, but don't see the fun in just leveling up again once I've already mastered 1 character.
Personally I stopped right before choosing who to side with at the end and have fun doing the different endings, collect more loot for my house, explore more stuff, have fights with groups of spawned enemies a LOT and complete odd and end quests I've missed.
What do you guys do other than just start all over?