Ive got both my original villages for vv1 and vv2 going. theres 5 slots to fill so i have no need to delete them, ive had more games in those other slots that i cant count them anymore, but the original ones are still there, just check on them once a day stoke the fires so to speak lol, their pretty self sustaining.
The other slots ive tried different things, meduim dificulty, hard dificulty, finish puzzles b4 anyone dies, most points in a certain time, etc etc,, so yeah try anything, getting everyone dressed or looking the same, ive had that too. im sure theres other ways you can challenge yourself.
Try and have fun.