I found an SMP that just expanded the world size from 6000 by 6000 to 9000 by 9000. There is a server wide medieval castle event happening right now so it feels like everyone has something to work on together.
It is not pure vanilla. It has player jobs plus a shop and economy. There are player warps and player chest shops so trading and traveling is a big part of the server.
They also built a brand new spawn and switched server locations. Bedrock players can join too.
