Volunteer doing what? Donate to what? Boycott what with what demands? What's the most successful boycott in your estimation? I can only really think of buses in Montgomery and the Swadeshi movement in India, but even that started in like the 1910s and they didn't get independence until 1947 and who knows how much it mattered. If there were a big crank somewhere and you could guarantee me that turning it gives better than 50% odds that the world gets better in the ways I consider better, I'd be turning the crank. We'd all be turning the crank! But what's the crank?