Rosedalean SMP is a Java survival server on 1.21.11 that feels like vanilla but with extra stuff added in. It has an application system so it can keep trolls out and keep the community chill.
The server has a mix of casual players and hardcore players so you can play how you want. There are community run events and you can join a faction or even make your own.
It uses add ons so you do not need to download mods. You can use simple voice chat and explore Terralith style biomes. There is also a ticket system if you need help and a BlueMap so you can see what the world looks like as people explore.
They also do events and weekly game nights every Sunday. The staff takes suggestions seriously so players can help shape how the server runs.
