You have /var mounted in its own partition, this shows that your initial installation was before 2.21 when the partition scheme changed, meaning before 2018. The easier solution for you is to backup your settings, make a clean install of a recent version of IPFire and restore your backup. The kernel gets bigger with time and occasionally this change becomes necessary.
Last time I did a complete reinstall and restored it via the backup was when spectre was a hot topic. The main reason then was the architecture, because the old ipfire build where i585 based and for proper spectre fixes I had to upgrade to x86.
Today I did my reinstall, sadly the backup killed the installation. Maybe it’s because I included logs ? I don’t know. After restoring the backup everything worked, did a reboot - system was unreachable and the web interface didn’t respond. Ipfire had a Ip address assigned so it should be reachable…….
The god part is I do not have 100+ clients and the config is quit streamlined, so 2 hours later the system is up and running again its old glory. Hopefully the partition problem is now resolved for the next 5 years……………….