Without physically changing anything with respect to draw weight and arrow weight........yeah Extreme1 is correct, you are pretty much limited to lightening your string load as much as possible.
Do away with excess nock sets, try a tied in version instead or a string loop, lose any tube style peeps if possible, or go to a "No-Peep" alternative etc. Kisser buttons are generally not necessary.........I have seen string loads that weight a ton and really aren't needed at all. It's just that many people don't really understand that that stuff negatively affects bow performance.

Any chance you can grow a few inches and increase your draw length?