This image tells the story for how you want to and need to get your message out.
You have your community, these you can reach. These you can talk to. Those folks have their network. Your message will spread via their conversations if compelling enough. If the message is indeed, clear, consistent, and has a compelling call to action - then the larger crowd can join in.
You don't focus on the crowd. You feed the community, the circle that is close to you.
I talk more about this in my "Fire Circle Story" which is written here and you can find an audio version of here
Thanks to Rachel Happe at the Community Roundtable for the pointer to Amy Sample Ward's image