This is a feel-good story about a man who transmigrates into a prince and starts from scratch in a poor little border town in a low-magic world, using his "golden finger" to trade the productivity gains of development and construction for weapons, machinery, and weapon girls.
If we're going for excitement, then let's go all in on weapon girls and farming!
By the way, the author is a veteran Paradox gamer, Civilization player, and Total War player, as well as a longtime reader of historical novels on Qidian. So you may occasionally spot some of those flavors in this book. Fans of those things, and military enthusiasts, don't miss out! If you're unfamiliar with them, that's fine too. Just read it as a standard harem farming power fantasy.