I found KingdomsMC and it is a world building roleplay SMP where players can make their own kingdoms and shape the server history.
You can found towns and grow into nations. You can do diplomacy and trade with other groups. People can form alliances or try to gain power through influence.
It has custom plugins with player made items plus roleplay mechanics and advanced building tools. There are quests and server lore with events that can change what is going on in the world.
The world is meant to stick around so you can explore old town ruins and find mysterious artifacts. It also supports both Java and Bedrock and it says 1.21+.
The community is described as welcoming and focused on creativity for roleplayers builders and explorers.
