Remove peep get a anchor sight or hind sight.
Remove string silencers.
Get a new string made from a faster material, some of the cheaper bows can gain 15fps with new string alone.
Have the bow paper tuned will increase fps.
Have a smaller d-loop and a release aid that allows you to increase draw length.
Remove brass nock if you have one.
Get a lighter arrow, 5 grains per pound min.
And last but not least, shoot from the back of a pick-up doing 60mph,i saw it on myth busters.