Onion SMP is a survival server on 1.21.11 with crossplay so more people can hop in.
It has claims so you can protect your stuff and it has keep inventory on so dying is not a huge pain.
You can use rtp to get away from spawn and there is combat log protection so fights do not feel cheesy.
There are teams if you want to play with friends and there are daily events to keep things active.
Onion SMP Crossplay Survival 1.21.11
Chill longterm worldCommunity Events HubGrief protection focusKeep Inventory enabledweeknight chill sessions
GG.MINEWIND.NET New Server IPOnion SMP Crossplay 1.21.11 Survival
I found Onion SMP and it is a survival server that says it supports crossplay on 1.21.11.
It has claims so your builds can stay safe. Keep inventory is on so dying is not a huge disaster.
You can use rtp to get around and start fresh spots. It also has combat log protection and teams so people can play together and not dip out of fights.GG.MINEWIND.NET New Server IP