Sorry, some China "successes" come at a cost. What was stopping the CPC from enacting the NSL in HK much earlier? Why was such wanton damage needed before they bring in the NSL? Could it not been done right after the rioters destroyed the legislative council? Answer: not assertive enough.The Chinese government has proven time and again that the most obvious course of action is not necessarily the wisest.
In HK, everyone was expecting the Central Government to step in and quell the riots. Instead, the Central Government provide support to the HK government and enabled the passing of the NSL, which completely neutralized the US sponsored insurgency without a single shot being fired by the PLA. Of course, the cutting of CIA funding behind the scenes also played an instrumental role.
When Pelosi visited Taiwan, everyone expected a direct armed confrontation between China and the US. Instead, the Chinese government allowed Pelosi to land safely and instead used the incident to normalize the conduction of military exercises around the island.
You proposed for China to match US trade bans in a tit for tat response, except you failed to realize that economic decoupling was exactly what the US administration was seeking. Why should China help the US achieve its aims? So long as China has trade ties with the US, China has leverage. Ban those trade ties, and you lose that leverage, as the US found out with their tech bans.
As for the other proposals in your post, they are even more childish. Dumping US treasuries? Sailing off the coast of Guam and Hawaii? Those are as empty gestures as the US FONOPs in SCS. Worse, those responses are eminently predictable. That means the US would be able to dictate Chinese actions through their own.
As Chairman Mao once said: 你打你的,我打我的。Never let your adversary dictate your responses.
Pelosi is not a good example. Will US shoot down Li Keqiang's plane if he was visiting Hawaiian independence figures? China was never going to shoot down Pelosi's plane.
The west are run by overgrown children. They do childish provocative moves. China has been responding with language like, "we oppose, we protest, the west should correct their mistakes". How is that working out so far? Have the tempo of US provocations increased, or decreased? You tell me.