Corrupted save files?

@IdaliaMay  Please try playing in a clean user data folder.  Move the entire Sims 4 folder out of Documents\Electronic Arts and onto your desktop, and when you launch the game, a clean folder will be created.  You can quit from the Main Menu, then copy one of your affected saves to the new Sims 4 folder (saves go in the saves folder, unsurpringly) and see whether it crashes.  Don't add any other content to this folder at this point.  It doesn't matter if you get a missing objects warning—this is just for testing, and the original copy of your save will be in the old folder, intact and unaffected by anything you do to the copy.

Let me know whether any of your saves, older or newer, works without crashing.