Re: Xbox one Sims 4 will not load, it gets stuck at a little towards half way..
Have you tried clearing locally saved data? As a first step go to Sims 4 on your console home screen (when your game is not running) and use the button with 3 lines on it (menu button) go to manage game and add-ons. On the following page go to Saved Data, that will take you to 2 sets of data. Pick the first set of data next to your gamertag/username and delete from console only at this point. Ignore Reserved space. Then immediately load up your game, it should do a data sync while loading.
That's a lot to run on an Xbox one so once your game is running I'd clear some game storage. I'd check your save files aren't excessive. On Xbox Series X I never run more than 3, currently it's just 2 and one of those is my backup. I keep my library virtually empty. I clear extra Townies from Other Households daily as more are created by the game after travelling etc and they can really slow down your game if they get out of control. Since I got For Rent and Lovestruck I'm getting several new ones each day. Also I clear the personal and household inventories of any households I'm not playing, even fridges. These are tips we see regularly on this forum but I've also had this advice from Xbox Support when I was on Xbox one.
There are additional steps here you can also try:
