We'd need to educate enough people world wide on effective tactics and preparation for a global general strike (info on how to do that here), and coordinate a single date for it to begin globally, which would essentially shut down the world economy.

With enough education on how to implement decentralized horizontal societies beforehand, we could effectively cast off capitalism without falling into the authoritarian pitfalls of the past, much like Catalonia was able to do in the 1930's..

The end result of that would be the effective elimination of poverty, homelessness, hunger, and resource scarcity after implementing a gift-economy, not unlike it's portrayed in The Dispossessed. This would also mean all of us would only need to work about 2 to 3 months out of the year to maintain the base needs of everyone, with the rest of the year being free time to do with as you please. The lack of profit motive would also set us up to stop the progression of climate change before it destroys humanity and most other life on earth.