Not really that simple. Dozens have countries have all of those things. Typically they just remain poor.

Political stability is probably a big part of it. China hasn’t done great in this area but it has outperformed most developing countries. From 1980 to 2010 they had a talented string of leaders. Seems that has ended in the last few years though so unclear what happens next.

One child policy is probably some of it too. They had a few decades with a lot of young adults relative to the elderly and children. Again, about to hit a demographic brick wall but it did help dig them out of poverty.