I think it’d be cool if all the players in a server are part of a country in a constantly changing state of warfare and alliance with other countries in a huge world. Where your goal is not to level up, but to participate in actions that expand your homeland or fend off invaders or expand your economy.

The larger and wealthier your country becomes, the more you become a threat to other powerful nations who will want to stamp you out. Or maybe there would be revolutions, alien invaders, etc. if you become too powerful.

Alternatively, if the players of the realm fail to defend their lands or make peace with their enemies, they might be conquered and forced to live under another empire, fighting their wars and paying high taxes, until one day they can scheme to win their independence again.

Of course, this does essentially mean your world can become irreparably messed up, but that’s life. Maybe people would give up on a server and move on to a new world with new ambitions about how they can do better next time.