Thieves in the Late Ming Dynasty

At the end of the Ming Dynasty, the Manchu and Qing Dynasties invaded, rogue bandits were rampant, the Central Plains was corrupted, the people were dispersed, thousands of miles of fertile wilderness turned into white land, and only one or two household registrations remained. The Chinese nation faced the most critical situation in history. A modern ordinary white-collar worker travels to the late Ming Dynasty. What should he do?