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This command is helpful to track the disk usage and bring it down to the disk usage hogs.

du -h <dir> 2>/dev/null | grep '[0-9\.]\+G'
Replace <dir> with your desired directory (for root use / )

du -h
Shows the directory and the sizes of each in a human readable format.

2>/dev/null
Discards output of non directories (such as /proc/)

grep '[0-9\.]\+G'
Sorts out directories that is 1+ GBs and up.

https://cloudcone.com/docs/article/check-which-folders-use-the-highest-disk-space-in-linux/