Sims 4 hasn’t worked on my Mac for over a month, but no one helps.

What issues are you having? Could you explain what is happening that the game isn’t working.
Try also resetting your sims 4 folder, and testing in a new save game without putting back any of your data in the sims 4 folder and see if the issues remain.
https://sims4.crinrict.com/eng/2014/09/resetting-the-game-to-factory-settings-without-reinstalling/