Most servers stay empty because nobody can find them. Lobby listing puts yours where players already are.
Put your server in the Kixa lobby
Open your server's Settings.
Turn on Lobby listing.
Your server now shows up in the compass server selector at play.kixa.host.
How players find it
Players join the lobby at play.kixa.host, open the compass and pick a server. Listed servers appear there, so people looking for somewhere to play can find yours.
If your free server is asleep, picking it in the lobby wakes it. Players wait in the lobby while it starts.
Share your own address too
Your server also has its own address, name.kixa.host. Share it with friends so they can join straight away without the lobby. Bedrock friends can use bedrock.kixa.host to reach the lobby.
Common questions
Does lobby listing cost anything?
No. You can list free servers and paid servers.
Can I stop showing my server?
Yes. Turn Lobby listing off in Settings. Friends can still join with your server's address.