@gbaisdenI usually start a new family, too. Perhaps a family with a love interest for the current family, someone the teen could date? And maybe have the parents not get along.
Or rotate between the YA who moved out and the main family. Maybe make the YA super focused on career or partying with friends rather than having a family, since it sounds like you’ve done that a lot (seven generations!).
The main advice I have is to consciously do things you haven’t been doing so far. Buy a vet clinic or retail store, if you have the packs and haven’t done that. Or do a challenge. Or just pick careers that you never do.
I also do go to university and throw all the YAs from my rotational households into a single new household and move into the dorm together (so many loading screens! You have to move them out one by one!) You can use an apartment or shared housing and avoid the loading screen, but I feel like the dorm is a different environment from my usual households.
I generally don’t do this, but I’ve heard the advice to have your parents cheat on each other and get divorced. But I hear it often enough that I’m throwing it out there in case it appeals to you.
It’s really easy to get into a rut and sometimes you need to consciously shake things up.