Stop voting for politicians who want to get rid of existing bike lanes (Doug Ford - Ontario, Canada), stop voting for politicians who oppose high density residential zones (gestures at most of the developed world), and vote for politicians who have the best public transportation plans. Get involved with city politics a la the annoying people in parks and rec. It works. Donate to and get involved with your local progressive organizations (shout out to https://www.progresstoronto.ca/).