@francescaalavin You've tried most of the typical steps already. I can only think of a couple more things. First, run the Origin reset tool for macs, and restart your computer. Before trying to play, make sure Origin in-game is still disabled, since the reset may reenable it.
https://help.ea.com/en-us/help/origin/origin/how-to-reset-origin-on-mac/
If that doesn't help, drag your entire TS4 game folder out of Documents and onto your desktop, in case it contains a corrupt file. If the game launches, a clean folder will spawn with no content, and when you confirm that you can play in that folder, you can try moving the contents of your Saves and Tray folders into it from your old TS4 game folder.
The other step to try is a Super Repair. Here are Bluebellflora's instructions:
https://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-4-Mac-Help-Guides-and-Troubleshooting/m-p/5080860#M815
Hopefully, one of these steps helps you. But if you still can't play, please post your mac's specs here, as described in the link below, and list the packs you have installed. A number of mac users have reported the same issue in the last couple of weeks, and we're gathering information on the types of computers that are affected. We'll keep everyone updated, but in the meantime, more info would be very helpful.
https://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-3-Mac-Help-Guides-and-Troubleshooting/m-p/4756624#M4
Oh, and please also mention if you have any third-party antivirus or firewall, or any program like Mackeeper that's supposed to organize your files. If you're not sure, you can try booting your computer into safe mode: hold down the shift key as soon as you hit restart, and don't release it until you see the login window. This should disable all third-party apps. If you can play in safe mode, slow as it may be, that means some other app is interfering with TS4. You can leave safe mode by rebooting the normal way.
