How do you stay motivated to play the game?

I'm prone to having a burst of obsession with playing TS4 for days on end to not switching it on for weeks out of pure boredom. I don't really try and stay motivated, trying out new challenges and playing between saves would of been my suggestion, but it seems you've already done that. I do wish every Sim was an individual character, not just a few emotions from a trait making them slightly different.