xAutumnAngelx the Reserved Space is the one to ignore. That's a very large file for your locally saved data and may be part of the problem. When clearing it from the console and synching up with the cloud again you may find it's smaller afterwards which is better. But you might just be reassured carrying out any steps with Xbox support on a live chat with you.
I don't know how many save games you're running but I personally never run more than 3 on Xbox Series X. I also regularly clear Other Households as too many can cause issues. I'm getting up to 20 new ones each day at the moment especially after using public lots so I'm deleting them as I have enough. I keep my library mostly empty too as that helps (a Sims player on Xbox support told me that years ago), I clear all household and personal inventories of previously played households and Sims too. All these things can get the size of the game down and help with performance issues. I never store photos in inventories either as that's caused problems for me too.
Hopefully having Xbox support on a chat with you can reassure you while carrying out any steps with your locally saved data and with regards to your possible game corruption. Hope this helps, good luck.