Sims 4: My games crashes whenever I select to load/play/create a new house

@kloey23  You can add back the content from your old user data folder, not the folder itself.  Please move the files over in batches, testing each time to make sure the game still works.  If you get another crash, you'll know something you just moved is the problem, and you'll need to split the batch and test again until you've found which file(s) are causing the crashes.

Most of the files don't need to be moved at all—they'll regenerate when necessary.  Your saves are in the saves folder, your mods and cc in the Mods folder, and your saved households and builds are in Tray.  Be sure to keep the resource.cfg from the new folder in place rather than moving the old one over, but for the rest, you can delete what's already in the new folders and replace it with your existing content.

If you want a complete summary of what the various files are for, this is a good guide:

https://sims4.crinrict.com/eng/2014/09/user-files-explained/