How to clear cache or make some space available for my instance?

My Lemmy instance has reached 100% storage so I can no longer use it. Is there a safe way I can clear cache or make some more space available without upgrading the disk space? I set up the instance with the ansible script many months ago and migrating to object storage seems to be a decent amount of work I don't have to commit to currently.

I tried searching on the admin wiki (https://wiki.lemmyadmin.site) but I couldn't find anything