Simply stated, community means mutually supportive, loving relationships. We must be willing to be proactive in going beyond mere acquaintance into deeper friendships. We must practice what we preach. A person I was discussing this with said that he would feel a true friendship had been established when each person felt welcomed in the other person's home and when they ate meals together. Friends eat together and invite each other to visit at home.
People feel more a part of a community when they share in leadership.
Mailing out brochures rarely works. Personal invitations or invitations from a leader people respect in their local community make it much more likely that trust will be established. You may have to visit their congregations or homes personally, so they know you as a person rather than a title. It may also require bringing adult leaders from their own community with the children and youth. We must be adaptable to make it work.