@cathyyphan I've moved your thread to the Sims 3 Mac section.
Have you tried bypassing the launcher? Please do so, or if you're already doing it, please undo the change, at least to test.
https://bluebellflora.com/sims-3-how-to-bypass-the-launcher-on-a-mac/
If that doesn't help, undo the change, then run the Super Patch (digital download version), which should fix any issues with the game's program files. If you've taken steps to get your graphics card recognized, please save copies of graphicscards.sgr and graphicsrules.sgr, and add them back once the Super Patch has run—it will undo any changes you've made to those files.
https://bluebellflora.com/sims-3-manual-super-patch-for-mac-1-67/
If this doesn't help either, please create a new admin user account on your Mac and try to play in that account.
While testing, please let the game create a new Sims 3 user data folder each time: move the older one to the desktop, or just trash it if it doesn't have any content you want to keep.