I don't know if you are interested to read this, but I will anyway leave this here.
https://www.noemamag.com/how-china-avoided-soviet-style-collapse
The thing is that the party has support from the vast majority and most of the people think that a) west is evil b) other countries are trying to attack their culture c) they don't know about the problems as you do not read or hear about it. People get wealthier all the time and life is much better than 20 years ago.