There's also plenty of sim games in the indie market, Factorio, Banished, Frostpunk. Then things that are close to the market like They Are Billions, Kenshi, etc. to name a few I've personally had time to play. Kenshi is a bit rough around the edges, but absolutely brilliant in terms of sandbox play.
There's also the Endless series from Amplitutde studios, Endless Legend, Endless Space 1 + 2, that are of a vein of Civ games, plus they've recently brought out Humandkind (though to mixed reviews unfortunately).
The popular sim genre in recent times has been more 3rd person building mixed with exploration, there was the wave of multiplayer ones like Minecraft, Rust, Arc Evolved, etc. And then single player ones like Subnautica, etc.
So there's stuff out there if you want it, it's just not a very popular genre at the moment.