litecoin – How can I reduce the size of pruned nodes?

We pruned these nodes to the minimum (500MB and 2.2GB for Dogecoin), but as you can see, they are still relatively large compared to the pruning size.

How can I further reduce the size?

# du -shc /home/bitcoin /home/bitcoinregtest /home/bitcoincash /home/dogecoin /home/litecoin
13G     /home/bitcoin
117M    /home/bitcoinregtest
5.2G    /home/bitcoincash
14G     /home/dogecoin
4.0G    /home/litecoin
35G     total