@EllieBee242 The next step is transferring your saves and other content to the new Sims 4 folder. Start with your mods and custom content, and if the game stops working, test those files to find the problem. The 50/50 method can make the process much more efficient:
https://modthesims.info/wiki.php?title=Game_Help:Finding_Problem_Custom_Content#The_50.25_Method
Once you've done that, and the game is working with whatever mods and cc you want to use, add back your saves and Tray files, plus Screenshots and Recorded Videos if you care about those. The rest can be discarded.
@PianoMan565 Did you try the clean folder, and are you able to play without a crash? If so, please see the above. If not, please post a dxdiag.
https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/