Sometimes EU 4, lately quite a bit of Dominions 5, and then a ton of games that aren't TBS or Pdox and only count as "Civ 6 alternatives" insofar as they're alternative games.
For example, unless you're a really good player a game of Ultimate Chicken Horse would be pretty one-sided
. I've gone on 20+ win streaks joining random games for fun. The occasional lobby with all good players is amazing.
Dungeon Crawl Stone Soup is probably my most played game over the last year, but I'm not happy with recent design direction there, since "incoherent" isn't a direction that generally results in good outcomes. Still one of the best roguelikes I've experienced, however.
A few other games have a minor footprint for me lately too, but still more than Civ 6. Stuff like Rocket League/Hearts of Iron 4. I have yet to try TW: Atilla or Stellaris but I do have these in my library now and will get to them sooner or later.
Dominions 5 has quite the learning curve but it's a very deep game. I knew I had to try it after seeing some of the world's best players in Civ, EU 4, and other games independently recommend it.
One of the best games ever made. I recommend anyone to give it a try.
Some of the 1.0 changes really bothered me, but it's still a great game. I mostly stopped playing after hundreds of hours, but that's still a lot.
Quite a few broken things you can do, like molotovs through walls, ignoring thermodynamics and creating permanent heat/cold source w/o electricity, and punching enemies through walls 1-way for example. Also quite a few bizarre optimizations like "bedrooms shouldn't have floors" per the math. Good stuff. After getting multiple colonies off the ground with 1 man naked tribal merciless starts with Randy or Cas (Cas harder IMO) and the obligatory "launch ship from sea ice on merciless" runs I've done all I wanted with the game I guess. But my play certainly could have been optimized much more.