I found a simple SMP that puts the economy first. The big goal is to build up money and try to become the richest player.
It has a strong shop system and a player driven market where supply and demand matters. You can run your own business and make something that other players want to buy.
You can grind resources flip items in the marketplace and build big farms to grow faster. It sounds pretty balanced with fair progression and a community feel for players who like survival plus money making.
AntHill SMP is a fair and welcoming survival server that is focused on community and meeting new friendly people.
It is strictly 17+ and it is based in the UK but it accepts players from all over the world.
The server uses anti griefing measures so your builds are safer and it also has lots of quality of life plugins for 1.21.11. You can find things like ShopKeepers for player made shops plus Tree Feller and Vein Mine and BlueMap. They also say more plugins are planned and there are extra optimisations too.