I found Lounge SMP and it feels like a long term survival world that is meant to stick around. They say there are no resets so your builds and progress are supposed to last.
The server has active management and they keep doing improvements over time. The community sounds chill but still active and players help decide what happens next.
It is semi vanilla with a simple economy and unscripted lore that happens naturally while people play. There is voice chat and you can toggle pvp if you want fights or you want peace.
It is listed as 1.21.11 and there is also a Bedrock port option.
