You already have the attention you need
You likely have the attention of more than enough people to start something that matters.
Start with one, three, fifty, or one hundred; whatever small feels like to you. Then, focus on creating the best possible value for these folks, and you will help move us all in the direction we are meant to go; the direction of better.
It’s likely that you, like the rest of us, were misdirected and told that “more” is the direction you are meant to travel. But, unfortunately, these poor directions have led you to believe that 1 million or 1 billion is where meaning lives.
Start with the valuable attention you already have. Go for better. If more happens, let it, not at the expense of better.