Any action that might help your plant to set flowers depends on the reason why they are falling off in the first place. It could be because of a nutrient deficiency, too low temperature, too high temperature, too dry soil, too small of a container, etc… What are the plant's growing conditions? This will help narrow down your problem.
Otherwise, sometimes plants just drop lots of flowers before it feels like its mature enough to make babies. Unlike some humans I know… But that's a different story.