There are a number of ways your can make the community grow. You should make people ware about the benefits of bitcoins or share your experience with bitcoins on personal blog. Real life examples are convincing and thus they can motivate the readers to start investing.

Another way to help the community if by participating in discussions on various forums and bitcoin related blogs. Not only the members of that forum read your posts but the people finding the post from Google search also get a lot of information.