When is your screenplay a movie? One way to get your story fast is to create an imaginary trailer for your film before you write it. This trailer is not for a movie that actually exists! But after seeing it, we want to see the film.
Watching the trailer convinces us that it’s already been made. Describe the clips in prose form as if you are telling a blind person what you are seeing. Writing an imaginary trailer gives you a clear bulllseye to aim for and will help you feel that you are closer to achieving your goal.