It's unlikely that China would take on the entire western world all at once, China should strive to either get people off US's side and if possible bring them to their side.
China will have to take on the Western World at once.
“If you can convince the lowest white man he’s better than the best colored man, he won’t notice you’re picking his pocket. Hell, give him somebody to look down on, and he’ll empty his pockets for you.” - Lyndon B. Johnson
White people are incredibly racist and will never, ever truly accept a non-white as their superior. This applies to their sycophants as well (e.g. Japan, South Korea). China will never be able to convince a Western (i.e. White) country to get off the US's side, no matter how badly the US mistreats them.
* Slavic countries might be an exception, since they're looked down upon as "Lesser Whites" by the Anglos and Western Europeans. Hence China's inroads with Russia, Serbia, etc. Even then, I don't think China truly trusts them, nor should it.
So what's the strategy to deal with all of them?
Force them into a bottleneck road and cut them off one by one? Defeating in details?
Or is it dragging US directly into a fight and crushing it there? Once the "allies" see American weakness they start making excuses not to fight?
Match in conventional major power warfare + overmatch in asymmetric warfare (A2/D2, hypersonics) + sufficient nuclear deterrent + exploiting the tyranny of distance