Basically you can expand it with those three commands (adjust the size with the -L argument):
growpart /dev/sda 3lvextend -L +60G /dev/mapper/rl-rootxfs_growfs /
You can check out this topic for more info and context:
Expanding the disk always comes with little risk, so the best practice is to make a backup before expanding.
You can also consider expanding the root by only the amount you need for it. LVM gives you the possibility to create more partitions and expand every partion independently. xfs cannot be shrunk, so if you take all the space for / now, you won’t be able to create another partition at some point in the future.