many countries right now are also starting to get wary of the intention of China, at least in part this is exposed with the pandemic. Many countries are now starting to resist the influence of China. Many are now seeing that China can be a trap. Personally, I don't see China to be the one to dominate of the vacuum that will be left by USA in the global commerce, that position is reserved for another (still emerging) entity.
China is already "less dependent on us dollar" if they want to, they just do not want to because it is smart to own that much dollar both in cash and in debt. It allows them to leverage their future expenses, for every dollar they are owed, they could spend many times of that today, saying they will pay later when the debt they are owed to is paid.
This is why I do not believe the whole discussion about them not wanting to use dollars anymore, they are very much in love with it because the whole world uses it, and they could own literally nation sized lands in all of Africa by using dollars, they are literally growing their landsize by just purchasing using dollars.