gemeotmnl25s Makes sense, thanks!
The 2021 model iMac has the ARM chip which is currently causing issues. See this thread - [TROUBLESHOOTING] Sims 4 Crashing since 1/14/25 Update | EA Forums - 11007810
Updating to Sequoia 15.3.1 has fixed the issue for some. It would be really interesting to see if reinstalling Sequoia fixes it for you as you are already running 15.3.1. You can do this by downloading the Sequoia installer from the Mac App Store and running it. It doesn't wipe your Mac, it simply reinstalls the OS over the top of your existing installation, fixing any corrupted files, broken links etc. But you should do a backup anyway as good practice.