I wanted to play the game again, as its been a few years. Lo and behold there isn't any apparent way to reset your progress and start over on the Xbox. I tried deleting the save data but the cloud backup or whatever kicked in and restored the save data.
Also, make sure your controller doesn't just have that button broken. Try it on a different game. But really, this topic will probaby be removed. Just saying. Lol my xbox is brand new my controller is fine. BTW i found out how, just quickly press LB to quick shot or hold LB to aim and RT to shoot.
For Assassin's Creed: Brotherhood on the Xbox 360, a GameFAQs message board topic titled "is there a way to restart at a checkpoint and restore the full sync i failed?".

To restart Assassin’s Creed Syndicate on Xbox, press the Xbox button to open the guide, select “System Settings,” and then select “Restart. The easiest way to delete your save on Assassin’s Creed Unity is to go to the main menu, select “Options,” and then “Save Games.”

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To restart your Assassin’s Creed Unity on PC, you need to open up Uplay and then click on the Settings icon on the top right of the window and then click settings. From there you need to uncheck the cloud save synchronization option that will be located in the general tab. Then you need to open your program files and navigate to the Ubisoft Ubisoft had given this game away for free for a week, during the time, the Notre-Dame cathedral fire had occurred in mid April 2019. This was because the release allowed players to see the building as it looked like, prior to the disaster, as the cathedral appears accurately in this game. This reviewer received promo considerations or sweepstakes entry for writing a review. Assassin's Creed Unity gives a new element to the Assassin's Creed universe, multiplayer. I found this to be fun, but on my Xbox One it took a decent 6-8 minutes to find a game. This version of AC is placed in France, during the French Revolution. PKn8.
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  • how to restart assassin's creed unity on xbox one