The Communist Manifesto was written as an explicit response to capitalism. Marx's most important work is Capital. Returning to early cooperative societies is not what the Marxist position is, it's taking advantage of industrialization and instead collectivizing and planning society using what was created under conditions of capitalism as a base. Capitalism has indeed been monstrously damaging, but with the bad came the conditions for socialism.
You should read the Communist Manifesto, and history books as well.
How?