Yes, Trump did something about China.
He got rid of the most effective global efforts to contain China’s growth through the TPP. I know HN hates the TPP because of amorphous claims about IP, but flouting IP norms forms the entire basis of these actions by Trump, and the whole point of TPP’a IP protections (which HN hated, apparently) was to make sure China’s neighbors would not flout IP protections the way China did, giving private companies incentives to move manufacturing and research from China to the neighboring countries instead.
That would have been a broad ranging global effort to ensure China followed rules, that would have cost the US nothing (in fact other countries were making concessions to the US for it), and would not have required 2-3 years of barely legal efforts to contain 1 Chinese company and even there only in the US market, but would have instead affected all Chinese companies, non Chinese companies manufacturing in China, and not just the US market but also eastern Asian and Australasian markets.
So yeah, if by Trump did something you mean he dismantled an effort that would have been more effective by orders of magnitude and cost the US nothing but actually won it more friends in favor of a barely legal effort that is pissing off even allies that are not friendly to China and has taken 3 years to maybe impact 1 Chinese company, then sure.