Horizon 2 not syncing for atleast 3 months any help?

My forza will not sync my data from the cloud no matter what I do it has been doin this for atleast 3 months. When it does decide to load it goes very slow and once it gets to 100% it just goes to the beginning of the game. Iv tryed everything Microsoft have said and something’s on forums. It’s just not happening. It shows I have everythin on my forza hub