Game is Crashing Before it Reaches Main Menu

k1rbyheart  Your saves are in the folder you moved, and you can move them to the new Sims 4 folder now if you want.  But test your mods and custom content first, and remove anything that prevents the game from working properly.  If you have a lot of mods and cc to sort through, 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, move over the contents of the saves and Tray (saved households and builds) folders, plus Screenshots and Recorded Videos if you care about those.  The rest can be discarded.