do more strenuous exercise. more muscle mass will increase your metabolism, so you will burn off more energy, even in your sleep.
im not sure if you want to lose weight or specifically fat. if just fat, then definitely play sports, anything that will tire you out (if you can do 90 minutes straight of an activity, its not going to help burn off the last amounts of fat)
you seem very light for a guy your height anyway. how low a fat percentage are you trying to achieve?