In both the US and where I am in Australia, the two major parties are barely different and doubly so in regards to this whole issue. A vote is not going to mean a great deal.
But a vote that can make some difference is voting with our wallets. Can very conscious purchasing decisions made by more and more people remove some of the influence held by the very richest on our planet? Is that too dreamy?
Where possible, I try to avoid purchasing from the biggest brand in any category, but there'd be a lot, lot more I could do about this. If we imagine the typical food pyramid, but fill it with brands and apply it to every product and category showing the richest and most influential at one end and the delightful smallfry at the other, could we help motivate people to make better decisions about where they spend their money? Or even where they earn it? Earn a fraction less to work for a smaller supplier perhaps.
Apps, surveys, social media, gamification - these are all things that might help people make more careful decisions. Ride a bike, grow food or buy from independent greengrocers at least, seek out furniture that's locally made, etc.
Give me a site/app that asks me about my life and rates my efforts or motivates me to make a better choice in everything I do. Help me identify brands that feel independent but are actually owned by corporate monsters.