Andy Pakula's Growth Scheme is now endorsed by the GA and available on the Unitarian web site. Check it out and see what you could do to remove barriers to growth.
Probably the least obvious barrier is the desire to grow without knowing why you want to grow. If it's just to get "bums on pews" that's not enough. It has to be because you want to include others in your beloved community and share the freedom you have found. You have to put your own house in order and deepen the spiritual life of your community before you can get others to join it. You have to care about an issue that's unrelated to growth, and inspire others to join you in your quest for social and environmental justice. And you have to communicate your enthusiasm to others, using all the media available to you (both online and print).