Of course the point of Solnit is that resistance is not spontaneously "popping up like mushrooms", but the fruit of the mycelium of years of organising.

Which doesn't mean that you need years before doing anything, but it does mean you need to start organising NOW if you didn't already.

Find people, at least one. Or even better: join an existing organisation.

Then do something.
Just a little thing. Call a representative, and ask them to put up a fight. Or print a poster of a burning swasticar and hang it in the street. Or collect clothing and food for the people who need it most. Or ask an activist or an organisation you like, what they need most.

You don't have to invent the wheel. You can be a little brick. We don't need heroes, we need to organise. And we need many people who take a little step, and another one, and another one, until the mushrooms bloom.