I don't know if this will be of any help to you, but here it is.
Origin wouldn't work on my computer, so I updated to Catalina thinking it would help. Then it worked, but my game crashed constantly and was unplayable. I had to delete my Sims 4 folder (which made me lose months of gameplay and I was really upset) and go into the newly generated SIms 4 folder and delete a folder called "EAWebkit cache".
After that my game was fine. I haven't had any problems and it actually runs better than it previously did.