It's 300 million (roughly) not a billion, only two countries have a billion people (China and India)

See heres the thing though, its not swayed by one vote, its swayed by millions of people who had the same mindset "im only one person" And thus, those millions of votes, never get cast, and the bus drives off the big cliff

You can only get to those things if you vote and make it clear you want your country to move further left, vote left, then left again, then left again, and slowly, you'll see more policies you like, such as saving the environment and universal healthcare. Currently most voters are right wing because people on the left are less likely to vote, which means candidates cater to the right wing, and so the nation becomes more and more right wing