Make the sacrifice of ethical consumption. Refuse to support companies that are in the business of selling technology, weapons and other tools of subjugation to the party or allies of the party.

Buy products from Hong Kong protesters, while boycotting products from those who support the Hong Kong government.

They should sell yellow umbrellas and t-shirts. I would buy one.

in order of effectiveness:

1) don't buy Chinese goods.

2) share news like this and other examples about how China treats dissidents on channels like LinkedIn which are frequented by Chinese and those doing business with China pretending it's all good.

3) protest outside a Chinese embassy (don't forget your umbrella)

4) if you're in the loop and aware of such things then call out those Western politicians pandering to Chinese bureaucrats (I'm aware of infrastructure projects in SE Europe and Africa where plenty of dark money flows ... hello Croatia Tourism board, BiH, Serbia, Montenegro ...)