Did the Heir Apparent Rebel Today?

Xie Xingjian died from working around the clock in his previous life. In this life, he has an unbelievably great start. His father is the Duke of Chengguo, and his mother is the emperor's cousin. Xie Xingjian figures he can coast to victory in this life. But beneath the calm surface of the court, powerful aristocratic families are scheming against one another. Halfway through his nap, Xie Xingjian jolts upright as if at death's door: I can't coast to victory after all. I need to keep my head down. Two harvests a year of Champa rice, advanced urban construction and border defenses, a flourishing agriculture and handicrafts industry... Dingzhou, under the Duke of Chengguo's rule, is thriving. The people vote with their feet, bringing their whole families to settle there. Talented people from every walk of life hurry to join a worthy ruler. Xie Xingjian builds high walls and stockpiles grain... Wait, how did he end up proclaiming himself king? Did the heir rebel today? Thanks for asking. I'm in the capital, getting ready to ascend the throne. Theme: A good life must be created for yourself