Tailscale just so everything works out and about with minimal effort.
I have Navidrome on my pi4 streaming/transcoding to my Android with Symfonium.
Slskd runs on my pi and can be access via my phone browser.
Makes it simple to acress slsk anywhere, download flac and stream it right back as mp3.
Likely Mastodon.
Similar too Twitter/Bluesky and able to follow Lemmy, Kbin and lots of other areas of the Fediverse.