Looking for novels where people actualy use things that belongs to that world such as the races(should join the kingdom not just agree to be allies ), knowledge ,technology, magic ect. Somthing like Magic Industry Empire but based on a kingdom instead of business. Obviously most of the novels will be set on an undeveloped fantacy world however if you are able to find one set in a different genre sci-fi, apocalypse ect. please post MTL is fine just specify the site no BL
Game of the World Tree Release that Witch This Game Is Too Realistic Chronicles of Primordial Wars - not sci-fi and it's not focused on kingdom building but he did help his tribe to develop prosperously. PS: There's no romance in the novels I mentioned above.
I also recommend This Game Is Too Realistic, it's really good. Global Demon King: Starting as the Abyssal Dragon is another I recommend, but I don't think it's quite what your looking for.
Speed-run Civilization on meganovel. this one seems promising, it has a mc who is trying to build a kingdom on a desert island.
Bringing Culture to a Different World (the mc are sin demon, creating magic net using the elves tree of life as a server) others are.. Tyranny of Steel Mediterranean Hegemon of Ancient Greece Cohen of the Rebellion Enlightened Empire
Of all the masterfully works and average novels that exist you chose Magic Industry Empire as the standard? You should be ashamed!