I have some issues when installing Orient Me, so I ended up uninstalling and reinstalling several times. All of a sudden I found my / directory without free space. This is because every time you reinstall CfC it keeps tons of Docker files in the /var/lib directory. I checked and I had 8 docker.timestamp directories in my system. Once I deleted those I gained 39GB of space free.
So have a look at your /var/lib and delete all the docker.timestamp directories.