Hi, I'm Robinson, and I’m happy to help you today.
I know how frustrating this may be for you but I'll do my very best to help you.
As you tried several tutorials and troubleshooting and none of them have fixed the problem, you can try to perform the repair upgrade using the Windows ISO, this procedure will repair all Windows files and apps.
1-Download the Windows 11 ISO at this link.
https://www.microsoft.com/en-gb/software-downlo...
2-Double-click your ISO file, and click on the setup.exe file.
3-You may be prompted by User Account Control. Click on Yes if so.
4-In the Install Windows 11 dialog, click on Change how Setup downloads updates.
5-Select "Not right now". This will save you from downloading a new build (if available). Click Next.
6-Setup will check your PC and show a license agreement. Click on Accept in the license terms dialog.
7-Wait for the setup program to check for the available free space.
8-On the Ready to install page, click the Change what to keep.
9-Now, you can select Keep personal files and apps, Keep personal files only, and Nothing. Also, Nothing is the only option that will be available if your installation media doesn't match the installed Windows 11 version or language.
Note: It is safe to close the setup wizard at this step and cancel the repair install process. Otherwise, you won't be able to cancel it later. Finally, click Next.
10-Click on Install to start the repair install of Windows 11.
For the storage problem, you can use software like WinDirStat or TreeSize to find which folder or file is taking the space, and then you can repair or uninstall the app that is creating these files.
https://sourceforge.net/projects/windirstat/
https://apps.microsoft.com/store/detail/treesiz...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products).