make snapshot image first!
make snapshot image first!
make snapshot image first!

Supposed you have only one single xfs (/dev/sda1) partition.

Re-create root partition

(echo d; echo n; echo p; echo 1; echo ; echo; echo w) | sudo fdisk /dev/sda

Then restart (sudo reboot now) server.
Then, grow partition

xfs_growfs /dev/sda1

Verify with:

df -h