Mods won't show in game!

I last played Sims 4 on 11th May with my 5 gen family as normal. I opened Sims to play some more yesterday and my save was missing. I closed the game and reopened but my save sill did not load. Eventually, I accepted that I will just have to start a new save - not ideal as I loved my save but it is what it is. I also noticed that my mods weren't showing on startup like usual, and they weren't showing in CAS. I thought it was the way my game was saved on my hard drive so I removed it, uninstalled the game, reformatted my hard drive and reinstalled the game on it. Now when I have opened the game today, my mods still aren't showing in game but they are all in the correct folder like they were before this happened. I can't find anything online of this happening and I have no idea how to fix it! I'm upset that my game has reset itself but if I can get my mods to work, then I can create another save. Any help or tips is hugely appreciated :)