Sims 4 Not Launching

Breis17​  Thanks for providing that info.  The first step would be to move your mods folder to your desktop (you may also want to delete the localthumbcache.package file in The Sims 4 folder).  Then try to launch the game.  If it opens, you'll know it was a mod causing the problem.  Don't open or save any of your current save files at that point, to avoid making unintentional changes.  If the game doesn't open, please come back and report that here. 

If the game opens without your mods, I recommend clicking this link, which will take you to the official forums Broken and Updated Sims 4 Mods list.  It has an index to help you navigate and find mods that are broken.
Broken and Updated Sims 4 Mods and CC: 1.116, July 1, 2025 Game Update | EA Forums - 12291193

If for some reason you can't find any of your mods in the list, click this link and scroll to the section entitled "The 50-50 Method: Batch Testing" section for steps to test and find broken mods manually.
[INFO] How to Use Mods and CC | EA Forums - 9360653

I know this process can be a little tedious and time intensive, but it will be worth it to fix your game.  If at any time you have questions and need further help, you can always come back here to ask.