Ming Dynasty Immortal Family

Before he could recover, the agent said goodbye to the prosperous world and returned to the end of the Yuan Dynasty when the stars were still shining. Living in the valley, he didn't know whether it was due to changes in his body or something, but he actually succeeded in practicing according to the skills left by his predecessors. Time flies and it's the Ming Dynasty. What kind of changes and opportunities would the sudden arrival of an immortal cultivator bring to the Ming Dynasty?