I'm using Proxmox with a NixOS LXC for Jellyfin/*arr. The media is stored on a single btrfs HDD, because high uptime (RAID) isn't necessary for me and it's media I can simply redownload.
I'm looking into switching to NixOS on bare metal, because I don't need the UI of proxmox and most other features.
Symphonium is great for music, even though it's closed source and paid. I'm mostly using Spotify though.
Findroid is an awesome native Android app for watching tv/movies, altough it doesn't support transcoding.