Sims 4 folders won't spawn properly, no mods, no tray,

@niasimms5  You're looking in the wrong location for your user data.  Here's how to find the user folder:

https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/

For your old saves and other content, do you use OneDrive, and if so, does it contain any Sims 4 data?  If you find any saves or other user files (Tray items, mods or custom content, etc.) there, just move the files back to the folder the game is reading, as in, the one you find with the method in the article linked above.