I gave up recovering the corrupted SD card 
What I did is the following:
- Flash the initial NCP image I used (082021 image)
- Followed this NCP Documentation: Moving from armhf (32bit) to arm64 (Pi 4)
- Ran
sudo ncp-dist-upgrade - Ran
nc-nextcloud-update
I discovered that there are NCP configurations that had to be triggered or configured again.
- nc-static-IP
- namecheapDNS (not sure if all DDNS are affected)
Now I’m back running and upgraded to Bullseye and NC23.
(I had some issues with syncing though because my database backup was a few days older and some files had conflicts)