Advocacy is local, which is why I get so annoyed when people demand that I make "step by step videos" telling them how to fix their city (and get mad when I don't).
That's why I refer people to Strong Towns. They're a great first step to figure out what you need to do in your neighbourhood.
Otherwise, join your local safe streets or cycling advocacy group.
But either way, stop asking YouTubers and start talking to people locally.
notjustbikes