Hi
If that's not the issue, please provide more information about your Mac. Instructions on how to do so here - https://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-4-Mac-Help-Guides-and-Troubleshooting/m-p/4612396/highlight/true#M162
Which version of the game are you playing? Purchased from EA through Origin or from Aspyr through the App Store? Are you playing in online or offline mode?