What I did when I got bored of a save: I started a new one, with a new family. It just has more possibilities because I wasn't as restricted anymore because the old save just had too many families and not enough space for new ones.
What I did then is copying one of my favorite sims from the old save into the library, created a new family for her, gave her a new hairstyle, different clothes, different traits and a new name and it's like when you watch a new tv-show in which you see a character that is portrayed by the same actor like someone in the show you just watched before. It's so interesting to see her with completely different traits, meeting the other sims I created for the new save.