Koushaku Reijou no Tashinami
focuses on worldbuiding- literally- she has a fief. The villainess reincarnated at the time she is being punished. With quick thinking, she avoids her banishment and works to prove herself by bringing her family's fief towards glory. As she and her country grows, she'll soon have to return to her tragic past and rejoin high society. But there's something strange about the heroine and everyone who's infatuated with her, specifically the second prince's faction. All the while, a war brews between the two kingdoms. Very compelling. Not much stories go in depth about the ins and outs of what it's like to rule a country and I haven't yet seen someone use their past life's economic advancements as an easy head start in developing the fantasy society.
I’m a Villainous Daughter, so I’m going to keep the Last Boss