Late Ming Dynasty: Start with the Investigator

In the late Ming Dynasty, "people can eat each other" was written all over the place, but merchants from Shanxi and Huizhou were still extremely wealthy, and the south of the Yangtze River was still full of singing and dancing. Is this intense injustice destined to be unchangeable? It is obviously unrealistic for an ordinary person to travel back to ancient times and make inventions through technology. So what is his strongest point?