Windows profile cannot connect to windows account

Hi !

Problem:
My windows 11 profile cannot connect to my real windows profile, warns me loosing my work if I dont log off.
I can logon with a local admin user and would have access to my data, but I want to fix the problem with my normal windows profile.

Before it:
1. I had to play around to connect this pc with another one on the same network,
so I played with "share folder" settings, I activated / deactivated sharing folder options
2. later, had to change physical location, wanted to login again, don't ask my why exactly now, WINDOWS UPDATE was running
- the message was "trying to update", at least 2 restarts, finally I got to login screen
2. when I logged in again, and wanted to use the file browser,
it says, I need permission to access my own folders, it was the same with "documents", "pictures", and so on
so I said "ok accept"
3. next logins where like now, my profile is corrupt

I tried:
1. I saw the owner of my c:\users\myUserNonAdminUser\ Folder was the local admin account. I could change it to my myUserNonAdminUser,
at first there was a permission problem for the \AppData folder, after changing myUserNonAdminUser to an admin, I could solve this
problem
2. REGEDIT, I my profile under Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
- I created "RefCount" with value = 0
- reset "State" to 0
- I remaned profile folder, the folder had .bak at the end, I removed that
--> next login, the folder was again .BAK ,
so REGEDIT did not help
3. tried SFC , c:\Windows\system32>sfc/scannow
4. tried DISM /Online /Cleanup-Image /RestoreHealth

Any advice for me?

thank you for reading

Windows 11 Home , 21H2 , 22000.376 ,