We at VocaLounge encourage non-vocalsynth/"off-topic" content, but if you or a friend would rather try something with a more general focus, Mastodon•ART has a list of instances for creatives! (We recommend •ART, too!)
Like gaming (video or tabletop)? Try elekk.xyz ✨
Mastodon 3.0 and later (you can check the version at the bottom) let you migrate your account and followers, if you change your mind later! (And don't forget we have an @ambassador!)
A Mastodon instance specializing in Vocaloid, UTAU, and anything relevant to vocalsynth culture.