I found a nation called the Socialist Collective State of Arcania on the Worldbound SMP. It is built around unity order and strength and it is meant to feel organized and serious.
They have a clear leadership setup with a top trio and a council of ministers. Some jobs are already taken and some are open so people can actually join and have a role.
What you do here is mostly about building up the state. You can help with cities and infrastructure and industry. You can also join the armed forces to defend the territory or work your way up in government.
The vibe is not chaotic. They care about discipline loyalty and coordination and they want members to contribute in their own way while still supporting the collective.
