Hello, this is Emily.
The problem here is that you changed your username folder. This has resulted your user profile path being corrupted, thus Windows cannot sign into the user profile and created you a temp user profile to use for now.
Can you launch your File Explorer, go to C: drive > Users > Your username folder. Then go to Desktop, or Documents, etc to verify if you can see your personal files there. If so, I suggest that you copy them out to an external drive, such as flash drive.
After you have your data secured, can you see if this temp user profile allows you to create a new admin local user.
Hold down Windows + R keys, type in netplwiz and hit enter. Then click on "Add". Choose the option at the bottom that doesn't require a Microsoft Account, and set it up as a local user. Once created, double click on the user and go to group membership tab, make it admin. Restart the computer, and let me know if you can sign into this new admin local user.
There's a chance you may not be able to create it at all. Either way, please let me know how it goes and I will work with you next depending on how this step goes.
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