Sims 4 won't launch in the EA app 20/01/2024

@emma_g345  Among the many things you tried, did you ever move the entire Sims 4 user folder to the desktop?  Moving the Mods folder inside was a good idea, but it's possible for the folder to contain other corrupt files as well.

If this doesn't or didn't help, please run a dxdiag and attach it to a post.

https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/

And let me know what antivirus you use.  I've seen two reports recently that Surfshark is causing problems with Sims 4, but a few others block the game from time to time as well.