Save the Song Dynasty

When Zheng Yi was studying an item from the Song Dynasty, he was reincarnated by lightning and reincarnated into the Song Dynasty. There are still six years left before the Jingkang Disgrace. What can he do after his rebirth? Should he just wait for death or rely on his knowledge of Song history to become stronger? Should we just watch the Jingkang disaster happen, or should we change this shame? Should he watch the Northern Song Dynasty fall and Yue Fei be killed, or should he give a kick and change the fate of the national hero? Yue Fei, Han Shizhong, Wu Jie, Zong Ze, Lin Chong, all familiar people are all in "Elegy of the Song Dynasty"