How does the moment William discovers the small windmill work to move the plot forward?

William's accomplishment, the successful construction of a small windmill, moves the plot forward by opening up opportunities, as it garners attention of reporters and journalists. The media attention leads to invitations from the international community for William to attend different conferences and talk about the process and completion of his work. The conferences also expose William to new technologies, which he brings back to his community, thus, imrpoving the lives of his friends and neighbors.