It should be pretty obvious why Chinese music and dramas aren’t as popular worldwide as Korean music/dramas; the CCP censors everything deemed too ‘creative’ and sexual, and China seems to turn a blind eye to fostering the entertainment industry in general.
I saw some kpop group on a video ad on the Seoul subway promoting the Seoul subway system, that’s government sponsored!! You would never see that in China! sexy dancing girls sponsored by the government, who knew?
One of the top selling pop artists in China is a boy band that talks about how great the harmony and stability the CCP brings and how great China is, it’s like something they would do in North Korea. That’s why China will never get an international audience, unless they change this. Of course so far it hasn’t needed to since China has a massive domestic market.