Sims 4 Stuck on Loading Screen

These issues are not being caused by your game, but by your CC. Every time there's a patch or game update, there's a chance that your CC may stop working and, essentially, stop your game from functioning normally. You have to find which CC is incompatible with your game and either update it (if there is an update for the newest version) or delete it. I would recommend googling the mods halving method (take out half of your CC & test it by playing the game, rinse, repeat) until you find the CC that no longer works. There could be multiple files causing this.