I Was a National Preceptor in the Ming Dynasty

About the story of the late Ming Dynasty, the protagonist returns from the Southern Song Dynasty to preach Taoism. When he opens his eyes, the capital has fallen. As a descendant of Liu Bowen, the protagonist holds the empty title of National Advisor and Military Advisor, and his martial arts level has dropped to the early stage of first-rate. There is Li Zicheng's Shun army in the front, and Dorgon's Qing army in the back. Where should the protagonist go? Since Liu Bowen dug out all the dragon veins, the spiritual energy has become increasingly thinner. How should the protagonist improve the level of the world's martial arts civilization?