It's estimated 27 million Russians died during WW2. OP is saying that number is attributable to Hitler. The best estimate given the revealed USSR archives, emigres, and informants puts deaths directly caused or the result of neglect attributable to Stalin is 6.5 million.
Basically the first half of the meme is anticommunist, misinformation that ignores the deaths caused by fascists.
All of these are individual actions. I'd add organizing with other folks trying to make a difference. Direct action or political advocacy can have a much more significant effect than an individual acting alone.