Saves & Mods are gone! Sims 4 keeps starting up as a new game

@Jennarogers2197  Please make sure you're still running the standard version of Sims 4—the older version of the Main Menu is an obvious symptom of the LE.  You should be able to see which version is launching within Origin, or in the Task Manager.

If the saves aren't in Documents\Electronic Arts\The Sims 4\saves (or in the LE folder), look in OneDrive.  It often automatically syncs the contents of Documents; if your C driev is low on space, it can instead move the files to OneDrive and not leave a copy on your hard drive.  If you find your saves there, you can simply move them back to the Sims 4 folder on your hard drive.  The same goes for mods.

If you don't see anything in OneDrive, try searching your computer.  Open a File Explorer window, click This PC in the left panel, and type Slot_ in the search bar in the upper right corner.  That should turn up any saves on your hard drive(s).  Again, if you find them, put them back where they belong.  Check the location of the saves for any mods as well, because they may have been moved to the same place.