!cyberpunk@lemmy.zip - mostly games, movies, shows, and music in the cyberpunk sci-fi genre

!wavemusic@lemmy.world - music: synthwave, vaporwave, etc. A fairly new community, a couple different people have been posting

!gothindustrial@lemmy.world - music community. I was hoping someone else would make the 300th post, if not I’ll post something later today.

!fullmoviesonyoutube@lemm.ee - a larger community, a couple of us are posting regularly, but could use more discussion

!fedigrow@lemm.ee - a community about how to help grow the fediverse. @Blaze@reddthat.com has been posting a weekly thread on “how is your [niche] community doing?” which is kind of like a support group for people keeping communities alive