The King's Flag in the Dust and Mud

The consciousness of the modern man Wang Kang completely replaced the consciousness of the ancient poor peasant Wang Ergou, inheriting his body and partially broken memory fragments; unfortunately, this was the period of the Great Schism, when the central imperial power was declining, and the local nobles and nobles were powerful and frequently conquered each other, competing for land, population and orthodox status; how did Wang Kang survive, and what changes could he bring to this era?