Ok thanks. It seems difficulties involving Permissions have plagued macOS since its inception, and repairing them has been a moving target for about as long. What you describe is not supposed to happen any more.
Over the course of troubleshooting many Macs over many years I managed to do things with Permissions that Apple insisted were impossible to do. Having done them anyway, they proved impossible to fix. The solution in that case was to restore a Time Machine backup.
Assuming that is not an option for you, the only suggestion I am comfortable with is to reinstall macOS: How to reinstall macOS - Apple Support. Reinstalling macOS is nondestructive and will leave your User Account information intact, but it goes without saying you should create a backup before proceeding.
If you are adventurous though, in the past Apple provided instructions to repair Home folder permissions by using the Terminal command diskutil followed by a modifier verb. However, I am very reluctant (meaning, I won't) provide instructions for its use on this site. Not only did Apple withdraw that document, that particular Terminal command is not documented even in diskutil's manpages. Using it has the very real potential to make things worse, and as I learned, perhaps impossible to fix.
So for now, try reinstalling macOS. If that doesn't fix what's wrong, I suggest contacting Apple and having them walk you through it. Start here: Get Support
For reference please read Change permissions for files, folders, or disks on Mac - Apple Support. You might try selecting your Home folder, making sure you are its owner, and then using "Apply to enclosed items."
Make sure you have a backup first: Back up your Mac with Time Machine - Apple Support.