I have even smaller Root and Home partitions on my old machine, so I keep a eye on Disk free space like a hawk. I have no problems as a result.
ST is right, we have had a few conversations about partition sizes. It is good to have a apt and journal clean out once in a while, as they build up unnoticed.
Commands for apt cleanup are well advertised on here.
For journal maintenance I use this sequence, one step at a time.
journalctl --disk -usage
journalctl -r
then after visual review:
sudo journalctl --rotate
sudo journalctl --vacuum-size=100M
100M is on the small side, but you can substitute a different threshold value instead.