Historically, during the 16th Century, the Ming Dynasty's Navy was very poor, which is ironic, as nearly a century ago, they had Treasure Fleets to show their supremacy. After that, their Navy went into decline. Sure, they Ming had naval victories against the Portuguese in the 1520s, and the Dutch in the 17th Century, and showed they had the capacity to adapt, such as using the Wugongchuan, but after that, the Ming focused on Coastal Defensives against Wokou Pirates, and after that, the Ming Navy was barely noticeable until 17th Century.
So, what if, during the period between 1500s to 1590s, the Ming Navy was revamped, with large new ships, due to foreign encroachment, such as Wokou Pirates, the Portuguese, the Japanese? On another plus, they can also lift the Sea Ban, which the Longqing Emperor similarly did OTL, as he restarted trade with Europe, Africa, other parts of Asia.
So, what if, during the period between 1500s to 1590s, the Ming Navy was revamped, with large new ships, due to foreign encroachment, such as Wokou Pirates, the Portuguese, the Japanese? On another plus, they can also lift the Sea Ban, which the Longqing Emperor similarly did OTL, as he restarted trade with Europe, Africa, other parts of Asia.