kaktiu Yes, when you fix this, you can move your saves and Tray files to the new Sims 4 folder. But since the new folder didn't work by itself, I do think this is a system issue at least in part.
Do you have an external drive or USB stick available? You could put a dxdiag on that drive and upload it from a different computer. Or you could wait until you've moved and have internet again, whichever you prefer.
The problem is that I can't really make other troubleshooting suggestions without seeing a dxdiag. I can't see what kind of problem it might be or the specific way you'd fix it, and if that way involves downloading a new driver, you couldn't do that either. As an example, if your graphics driver is crashing, you'd need to download a tool that does a clean uninstall for you as well as the new driver, and I would link you the proper driver but don't know what that would be without seeing your dxdiag.
If you want to take a shot in the dark, you can try playing in a clean boot. This disables all non-Windows services, the idea being that if another program is interfering with Sims 4, you get it out of the picture. This only helps every once in a while though. Still, there's no harm in trying.
https://support.microsoft.com/en-us/topic/how-to-perform-a-clean-boot-in-windows-da2f9573-6eec-00ad-2f8a-a97a1807f3dd
The one service to leave enabled is the EABackgroundService, which the EA App needs in order to run. Disable the rest as described.
When you reboot your computer, go through the Task Manager's background processes list shutting down any service that doesn't absolutely need to be running, for example anything from MSI Afterburner to RGB software might still be enabled. If you accidentally kill a critical process and it doesn't restart on its own, just reboot your computer again.
Don't open anything other than Sims 4 and the EA App while testing, not even a browser window.
If this helps, you can selectively reenable services until you find the culprit, then either leave that disabled or (if it belongs to an app you want to keep using) let me know what it is so we can try to fix the underlying issue.