Can’t find files on Macbook after renaming

Hello. I wanted to change the name of my main user on Macbook, so I did so in Settings. I then saw that another administrative account should change the name of their ‘Users’ folder, so I did so and made the folder match my new user. However, when I restarted my Mac, it made me log into iCloud all over again, and it treated me like a new user. Also, my documents, files, and everything weren’t showing up, and they were titled ‘Documents - Local’, being empty.

I tried to change the name of the folder back, but it’s no use. Any help would be very very appreciated, I feel like I’ve lost everything