I like all those kind of chill "X Simulator" games, but I'd love to see a bunch of them all combined into one mega-game.
So like if there was a game where you could find parts and build a PC like PC Building Simulator, and also build a vehicle like Car Mechanic Simulator, you could cover huge areas like American/European Truck Simulator, grow crops like Farming Simulator, build a shelter like Construction Simulator, keep the place clean like Powerwash simulator and/or House Flipper and so on.
It'd actually be really good for a post-apocalyptic type of game I think, where you could scavenge all that stuff and build a base.