Well you could branch out, I have multiple saves with different things going on and I take a break when I'm not sure what to do with one.
In one save I play that with my guy we take turns controlling children and ourselves.
The next one is for the sim in my pic she's part of a legacy and her family has always given me trouble so I tend to move them save to save she and her father with half-siblings are the only ones. She has bounced between two guys and has kids with both of them she just can't pick and neither want to leave.
In another I played rotationally until I decided it was done I had a mix of families, happy, some with drama, cheating, lots of kids born there. That one is done I think.
Then I have one with aliens just making a family for them just had their first son, the story being they woke up among sims with a good bit of money as the woman is a princess and her love interest her butler. He chose to erase that fact from her mind, so she wouldn't see him as a servant they're good fun.
The last one with vampires pairing up Vlad with a woman that is something like his deceased wife returned to him and the goths...I did have another rotational one can't remember if I stopped that one or not but it's all fun for me.
Though when I can't think of anything I just take a break and do other things, watching machinimas gives me ideas too then I want to play again heh.