I think Write Freely is a good alternative, if we want to keep federation (which we should from my point of view).
An alternative to using a new domain name would be to simply replace Plume at blog.funkwhale.audio, but this would probably mean we loose all URLs? Also we may get into trouble with the federation.
I like the idea of planet, but maybe there is an more sea related word? I mean, we are Funkwhale! 🐋 🏝️