Ghostyhero User data, which includes saved households and builds as well as saves, is always stored in Documents > Electronic Arts > The Sims 4. Saves are in the saves folder, households and builds in Tray. If OneDrive is running on your computer, whether you use it or not, be sure to check both of these locations:
C:\Users\your username\Documents etc.
C:\Users\your username\OneDrive\Documents etc.
Where is the game itself installed, and where was it installed previously, if you know? You can see the current location in the EA App, under Sims 4 > Manage > View properties.
If you don't find anything, please let me know where the game is installed as well as whether OneDrive is or was running on your computer.