Best POD to Keep Ming Empire around longer?

I've been thinking of trying my hands at an actual timeline thing, and one the of the nations I've been thinking of doing one with is the Ming Empire.

So, I was wondering, if anyone had any good suggestions on what POD might possibly provide the best chances for keeping the Ming Empire around for a longer time. Feel free to include what effects this might or might not have, it may help me decide whether or not to pursue this.
 
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