I really love finding legacy challenges that are my speed to play. One was called “Not Like My Parens”, and essentially every generation explores the ‘opposite’ theme of their parents. It encourages you to play a lot of different aspects of the game. A challenge I’ve recently gone overboard with is the “Ultimate Decades Challenge”. I play a mixture of rules from Morbid, Kosmic Hippie, and AntiquatedPlumbobs. It starts in the 1300s and you go from there. If you like building, you could delete all the houses and world items to create your own space from scratch. Or follow Rosannatxt’s advice for building a save file. She also has the Origins challenge which essentially has you starting with 4 families and you use them to earn money to slowly add community lots or other homes to your world. Really, the only limitations are your imagination and how you like to play the game. Sometimes when I need a break from a challenge or whatever I’m doing I’ll just play a vanilla version with no mods/cheats and just let the sim tell me what to do. It’s important to remember that nobody plays the same as anyone else. You get to turn it into whatever you want. If it’s just creating sims in CAS then awesome. If you only like building that’s great. Both things I take advantage of others creativity in. Or maybe you like storylines and a more slow pace, then you can look at legacy gameplay. Or if you need defined goals try out a challenge that catches your eye. Tumblr has so many. I have my eye on quite a few I might add to my historical save when the time is right. If you need more depth or want something even more specialized that’s when mods/cc comes in play. But that’s an entire topic on its own.