Kixa has a Skyblock island starter map. Pick it when you create your server and the island is waiting on first start.
What the Skyblock island is
One shared island in a void world, with a tree and a starter chest. Everyone on the server plays on the same island.
Starter maps run on Paper, Purpur or Leaf with Minecraft 1.21.4 or newer.
Set it up
Sign up at kixa.host and confirm your email.
Choose Create your server, then Choose a template.
Pick Skyblock island under Starter maps.
Name your server, choose the Free plan, accept the Minecraft EULA and create it.
Skyblock or OneBlock?
Skyblock gives everyone one shared island. OneBlock gives every player their own single block that changes each time it breaks. Both start in the void.
Common questions
Can I add plugins to my Skyblock server?
Yes. Open Plugins in your server panel and install them from Modrinth, then restart.