How do you improve swimming times for a shorter swimmer?

After a few meets this year, I feel pretty demotivated for swimming. I am a 5"7 swimmer who has huge disadvantages against taller swimmers, I did heavy off-season training and consider myself a decent to moderately fast swimmer. I go around a 57.63 100 Butterfly SCY, 53.21 100 Free and feel like i'm running into a brick wall in the past few meets. I have natural disadvantages such as small hands and size 8.5 feet but a rather large armspan around 6 foot. I wonder what I can do to improve as a shorter swimmer, and since states is around the corner and tapering is about to start. My goal is a 52-53 100 Butterfly as that will probably bring me to all-state or a 53.27 national cut would be nice. If you can add some suggestions it would be nice.