Save unbootable Garuda PC with a reinstall without loosing docs

My Garuda PC has become unbootable (hangs on its way, complaining, not asking to solve this now because I already tried for a while the recommended tricks).

I’m back to it now and I decided to reinstall Garuda Linux from a USB key, like a fresh install but I’d like to keep my docs.

I’ve looked at

but this isn’t exactly my case.

If I remember well the install process can reuse a existing system and not do a wipeout?
Or shall I try to just boot on key, not install and somehow mount the drive and save my home dirs?

There’s only one SSD drive connected, dedicated to Garuda.

Thanks for your suggestions.

Next time..backup your files to a external drive or internal drive or network drive and only for this to use.
Do this by hand (my mind)
start live iso → mount (if not mounted) your home partition or folder /home/user/ and copy this all to a external drive. (cache folder not + .config folder only to compare for after, if needed or to have the own config files for example fish konsole or fastfetch).
Folder .local/share example fish for history files to copy in the new environment.
Perhaps you need only your “doc” folder then only this to copy to external drive.
If the os is installed, use a backup app or handmade backup to do this.