Saying new things and changing popular conversations seems to me actually one of the most powerful things there is.
For example, that’s why China massacred thousands of unarmed protesters in Tiananmen Square in 1989, and why it does whatever it can to prevent people talking about it, for example.
It might be more effective aid (than boycotting) for the Uyghur people to use the occasion of the Winter Olympics and its publicity, to add conversations there about the genocide (and/or about Tiananmen Square, and/or about Hong Kong protest suppression, and/or about Chinese actions against Tibet, and/or about Chinese policy towards Taiwan, and/or about Chinese censorship, etc).