I found a small and friendly SMP called the Underground SMP. It is a Java server on 1.21.11 and it is all about living under a giant bedrock wall.
Everyone starts trapped underground and you get to pick one of four kingdoms or areas to begin in. The server runs events where players can unlock certain items that are up above the bedrock wall.
The community is open to all people and they also want content creators to join in too. It sounds like a chill place to meet others and take on the underground challenge together.
Trapped Underground Kingdom SMP
GG.MINEWIND.NET New Server IPRealm of Thrones Survival War SMP
I found a survival multiplayer world that feels kind of prehistoric but also modern at the same time. The map is locked into a 3500 by 3500 square so everyone is close and you keep running into other players.
The whole vibe is kingdoms and neighbors. You can make peace or you can start fights. You never really know if the people near you will turn into a big trading group or just become total war criminals. It is basically kill or be killed if you want to keep what you have.
Players can build up power with resources and even working machines then they have to defend it. There is talk about fighting for oil and the stuff that keeps your progress going. Some places can turn into a pacifist safe spot for people on the run.
The server is still new and the owners say they keep improving it. They also say they listen to popular suggestions so the gameplay can change as people join and claim spots.GG.MINEWIND.NET New Server IP