Have to throw CK3 out as my personal favorite grand strategy game (though EU4 and the like are other options). There’s nigh infinite content in weaving the story of your family and realm, and mods add a whole new layer to it.

Tossing Song of Syx onto the pile of games. Even if you don’t care for the art style, the game is immensely deep, and quite frankly, addictive.