State backed planting of the sweet potato. IOT the crop was introduced in 1590, earlier adopting and/or government promotion would increase food supply and forestall famine. This would resolve one of two major problems, that of climate change induced food pressure on a population boom hitting Malthusian limits.
http://www.chinastudyabroad.org/indepthchina/1039-china-and-the-sweet-potato
The second problem was the collapse of global trade. The Imjin War had wiped out two of China’s largest trade partners, Korea and Japan. Simultaneously the Thirty Years War cut off the European market and access to Spanish New World silver dried up. This would be hard to manage as the Ming will have to find new markets and new commodities.