I've read a few over the years, but I don't have time to deep dive for any good ones, and just clicking on the tag Kingom building brings up some that aren;t really that. So if anyone could suggest some good ones that would be helpful. examples that I've read : Wortenia Senki Bug Player The World Online Arslan Common sense of a dukes daughter Overlord To Be a Power in the Shadows! reincarnated as a slime Isekai Apocalypse Mynoghra if it has game elements bonus points!
Release that Witch Cohen of the Rebellion Black iron glory Mediterranean hegemon of ancient greece Magic industry empire Tales of the Reincarnated Lord
maybe kingdom manga ? Mushoku Tensei (i spelled it wrong ) mofumofu to isekai slow life o mezashimasu (i recommend the manga version for more lore ) Cultivation Chat Group (the world is infinite and comedy gold) nozomanu fushi no boukensha 4 cut hero cage of eden gintama panlong isekai kenkokuki (the ace of the list)