Hey Ica 10!
How did you change the home folder name,
If you didn’t follow this article explicitly, it may cause issues with the user permissions:
Change the name of your macOS user account and home folder:
https://support.apple.com/en-us/HT201548
It does have to be done from a different Admin account, both the physical home folder in Finder, THEN matching the name to the home directory in System Preferences > Users and Groups > User > Advanced Options.
If it wasn’t done this way, you may need to create a new admin account and log into that one to correct it, and match the home folder/username and the home folder directory.
This may or may not be how it happened, but I have seen this procedure done differently cause many issues as far as permissions go, let me know, happy to help if I can!