Rec me any manga/manhwa where the mc builds some kind of empire. Business, cities, civiliz...

pick me up - he build civilization(?) I guess on the game he's transmigrated to.
https://www.mangago.zone/read-manga/pick_me_up/

https://www.mangago.zone/read-manga/chronicles_of_heavenly_demon/

MC build his clan

https://www.mangago.zone/read-manga/all_rounder/

MC build civilization in apocalypse

https://www.mangago.zone/read-manga/the_king_of_cave_will_live_a_paradise_life/

MC build civilization in cave

https://www.mangago.zone/read-manga/return_of_the_legendary_spear_knight/

MC building his kingdom

https://www.mangago.zone/read-manga/dungeon_odyss/

MC build his dungeon

Great suggestions dude!!