I found a chill SMP that is looking for more people to play. It is meant to be a smaller community and the owner might take a day or two to reply since they get busy.
It is a modded server so you have to message the owner to get the mods that match the server. The server also goes offline when nobody is on so if it shuts down you are supposed to tell them.
They want players around 13 to 18. The rules are simple no griefing be nice no NSFW topics and just use basic common sense so people can build and hang out without drama.

