I dont think they can do more. The problem is that there is strategic imbalance between China and USA.The Americans have been drumming up China panic and fearmongering quite a lot in the last month. From the ridiculously hilarious "China's navy is bigger than the USN" to losing simulated war games. Very devious manipulator who's basically done this so many times in the past, it's more a political statement these days.
Gotta watch what they do though. It seems there are moves toward building up justifications and anxious trigger fingers.
USA is used to being the global hegemon with influence and commitments spanning the entire globe. China, avoids security interests and guarantees on world like a plague.
So for China to disrupt the US it is very easy. China can and is actively building regional powers, from the South America to Africa to Middle East to Europe. In europe especially you can this on Xi expressing support for EU's "strategic autonomy" strategy every time he communicates with EU leaders. The same applies also in the Middle East.
China doesnt care too much if it loses influence on EU or Middle East because as long as these powers get stronger militarily and get more domestic resilient supplies then US will lose more influence upon them and then China with its more pragmatic leaders can offer economic incentives to deal with them without having the US interfere (1st example is EU-China deal, and many more will soon follow)
So for the US which it's economy is in relative decline the only thing which it can increase its influence is on the security domain which China's strategy of promoting regional forums, blocks and aiding on their domestic military capabilities directly counters the US security influence