You provided not much helpful info. If you have problems with your file system you are encouraged to provide some info about it…
Start a live ISO, try to manjaro-chroot into your system - if possible - and then share with us output of
test -d /sys/firmware/efi && echo efi || echo bios
sudo parted -l
cat /etc/fstab
sudo lsblk -o NAME,FSTYPE,UUID,PARTTYPE,PARTTYPENAME