According to this BBC review, 3.5% is the magic number. https://www.bbc.com/future/article/20190513-it-only-takes-35-of-people-to-change-the-world I mentioned this elsewhere, and a reader commented that many of these 'velvet revolutions' are actually subverted by powerful interests. Which may be true, but at least some of them were genuine. We can hope, and one important thing is to build community and then stage a perhaps spontaneous show of power, once the community is large enough.