How to get rid of "Operation not permitted" in the terminal

Hi,

I have uploaded files (pdf, mp4, png) to Drive and now almost none of them work, neither when I try to open them in the Drive desktop app nor in the web version. I have even tried downloading the files into my Macbook (Pro w/ Ventura 13.2) Downloads and opening them from there and it says the file cannot be opened because it may be damaged.

The closest think I find on Google's own guide says:

If you use Drive for desktop on MacOS Mojave or High Sierra, permissions required to sync Drive files can get corrupted.

To resolve this issue:

1. On your computer, click Finder Applications.
2. Open the Utilities folder.
3. Click Terminal.
4. Enter sudo kextcache -clear
5. Press Return.
6. Enter sudo mv /private/var/db/KernelExtensionManagement /private/var/db/KernelExtensionManagementBackup
7. Press Return.
8. Enter sudo kextutil -l /Library/Google/DriveFS/dfsfuse.kext
9. Press Return.
10. Launch Drive for desktop.

When I try to do point 6, the terminal says: "Operation not permitted"

I have already done the granting full access to terminal but it's not working. I don't find any other way to open the files.

Any ideas please? I got 300 files that have taken me hours to download and arrange. Would be great to skip doing it all again.

All the best