Do you have any of the sims 4 expansions?
What an interesting discovery you have made in your adventure, the Sims 4 is a good game, I played the 3 for a long time, so I should go back to play this one, I saw that it has many new things since the last time I played it.
You don't need any expansion packs for this. But I have all the expansion- and game packs. Haha. The Sims 5 is actually coming, you may wait until then. But The Sims 4 base game is for free, so you have the opportunity to try it out anyways :D
You can read about a lot of my adventures in the Sims 4. I have written about play through of different game packs. There is a lot of secrets!