I accidentally "mounted" the wrong partition and now I can't unmount it unless I format it

This is the structure for my second drive where it’s installed casaOS. Unfortunately, I selected the wrong partition. I selected the 2gb partition instead of the 1.8t one where all the data in the home directory is.
nvme0n1 259:0 0 1.8T 0 disk
├─nvme0n1p1 259:1 0 1G 0 part
├─nvme0n1p2 259:2 0 2G 0 part /var/lib/casaos_data/.media/nvme0n1p2
│ /DATA/.media/nvme0n1p2
│ /media/nvme0n1p2
└─nvme0n1p3 259:3 0 1.8T 0 part
I try with this:
sudo umount -l /var/lib/casaos_data/.media/nvme0n1p2
sudo umount -l /DATA/.media/nvme0n1p2
sudo umount -l /media/nvme0n1p2
but after reboot the disk is mounted again