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So, my idea was The City Mod. What you would do, is build a city, and mark it with new special marker torches, then you would type /mark torchmarkers and you would get teleported to another dimension, which would be called "The Citylands".
There would be people spawning and chatting, you would have some normal life items, such as phone in multiplayer so you could do private talk.
So, what would be your task, is that you would run Minecraft Inc., and you would sell normal blocks and items to other people. If your money balance would go below $0, you would get teleported to overworld.
If you would keep going with your balance, you would need to pay $10 a day to keep the families on.
Thanks for reading and diamond if like!