Anubis1983 Among the steps you took, did you try playing in a clean folder? If not, please do so now. Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop. When you launch the game, a clean folder will spawn with no content. (Your saves and other content will be intact in the folder you've moved but temporarily unread by the game.) Don't add anything to the new folder yet; just start a new save and see how it runs.
If that doesn't help, please try playing in a new admin Windows account. Make it local, as in, don't link it with your Microsoft account or any email address. You'll be able to launch the game without reinstalling anything, but your user data won't be available.
Let me know which problems persist in each instance. Either troubleshooting step could solve some but not all of them, and that's helpful information too.