Sims 4 won't load past main menu

@Aristianassa  Please try a few things together, to be extra thorough.  Disable your antivirus for this test.  Create a new admin Windows account, and make it a local one, as in, don't sign into Microsoft.  Try playing in a clean boot in that account.

https://support.microsoft.com/en-us/topic/how-to-perform-a-clean-boot-in-windows-da2f9573-6eec-00ad-2f8a-a97a1807f3dd

The one service to leave enabled is the EA BackgroundService, which the EA App needs in order to run.  Disable the rest, as described.  And when you reboot, go through the Task Manager's background services list shutting down anything that doesn't need to be running, for example anything from MSI Afterburner to RGB software might still be active.  If you accidentally kill the wrong process and it doesn't restart on its own, just reboot the computer again.

Finally, put the EA App in offline mode before launching the game.

If this helps, you can undo the interventions one at a time until Sims 4 stops working properly again, and then you'll know where the problem is.

If this doesn't help, please do a clean uninstall and reinstall of Sims 4 and the EA App, still with your antivirus disabled, at least until you can test the game once.  Start with Sims 4:

• Put aside your Sims 4 folder in Documents\Electronic Arts and rename it to something that doesn't include the words "Sims 4."
• Download Revo Uninstaller (the free version is fine) from here.
• Launch Revo, select Sims 4 from the list, and click Uninstall.
• Once the game is uninstalled, select "Moderate" under "scanning modes," and click Scan.
• Review the list, in case there's something you want to save; otherwise, click Select All, and then Delete.
• Close Revo, and restart your computer.

Uninstall the EA App with Revo as well.  I don't have instructions for that at the moment, but the process should be straightforward.  Restart again when you're done.

Install the EA App, then create a new folder into which you'll install Sims 4.  The folder should be on the root level of the drive of your choice, for example C:\Games is fine, but not C:\Program Files\Games.

Keep the other interventions in place the first time you test, and there again, start reverting settings if the game works properly.