I used a different method though I don't how safe it is. There were some huge directories in this location /var/lib/docker/overlay2/ I cleared some of them and managed to reclaim over 100GB. All my data seems to still be there.
That is the backing host directory for the Docker container so hopefully you ended up clearing the same files. I would recommend working from the container as I described rather than from the host. There are folders other than the tmp folder in overlay2 that would not be safe to remove.
Please also make sure that you restart Central if you have not already. I added more details to my instructions. Submissions will not work if you skip this.