Although it's not new now, you should definitely try the Frog City Imperialism series(they're on GOG). Very taut, economic-oriented 4X games, they're turn based

Although it's not new now, you should definitely try the Frog City Imperialism series(they're on GOG). Very taut, economic-oriented 4X games, they're turn based and spiritually precede the Paradox games in how they move away from the wargame unit-movement and city-management trope in favor of mechanics around province boundaries, transit links, and centralized production sliders. There are occasionally new 4X games that appear on Steam but I haven't found one I like yet. Actually, maybe you shouldn't try Imperialism if you don't have a few days free. It is a dangerously addicting game, especially the second one.