When I get bored of gameplay I make over my worlds. Taking advantage of the gallery has been a bit of a game changers for me.
Now when I start a new save I first spend time replacing all the ingame lots. Then when I do start playing, I have my sims get out of the house just about every sim day. Since I've replaced all the lots there is tons of stuff for my sims to go do.
There is a YouTuber named simgraze that makes good videos with lot recommendations. There is also a lot of talented builders on YouTube. When I'm trying to find lots I usually search on YouTube, the builders list their gallery ID in the comments.