cloudlinux-root almost full

Hi, i can't see how to resolv this problem ... Currently we have 2 server running at 90% used of this /dev/mapper/cloudlinux-root FS. 1 other one, almost the same config and running also since some years (CPanel on CloudLinux) is only filled at 36%, with the same exact disk size (50Gb) Can someone explain where all this files are filling this ? Thanks Best regards