Wearing a mask is the only halfway feasible change that has an effect on virus spread that enough people are willing to do in the US. The virus is largely under control in other countries, but they were able to enforce much more draconian measures.

The mask wearing cultures have fared considerably better than others.

That being, said has the working group made any update to their predictions / statements.

https://www.kalzumeus.com/covid19-japan-white-paper/