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Sunday Is Gaming Day: What Are You Playing Thread
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
I can't think of many games that are like Dominions 6, except Conquest of Elysium 5 (same devs), which is a bit different and simpler.
If you mean 4X games in general, Stars in Shadow is currently very cheap—it's about 6€ for me on Steam (including its DLC). It's a Master of Orion 1-2 inspired 4X game made by a single dev. One nice thing about it is you can play a game rather quickly, so no 10+ hour sessions for a full game.
I like it quite a bit, but the scope is a bit smaller, so it's not a game for 300+ hours in my opinion.
I love 4X/Grand Strategy games, so if you give me more to work with, I can give you better recommendations.