depends on what position you play and your strengths are right now. First off I would work on your defense. If you can stop the big scorers on your team during practice your playing time will increase. A lock down defender at the 1 or 2 position sets up for a great defensive team. Second work on your ball handling and passing. If you can get the ball down the court and run the offense with minimal turnovers you will be priceless to your coach
I am also a 5.8 guard and i had a simular problem. I was always a good shooter but my problem was that my ball handeling was not the greatiest. so to be a better scorer i think you should work on ball handeling (left and right cross over). If iu have fast handels u r really hard to guard.
I would talk to your coach and find out what you need to work on. Maybe there are some skills he values more than others that you could work on. It's tough to really tell without actually watching you play
I am a former college basketball player and current basketball skill trainer. (http:www.theworldofhoops.com)
But more importantly, I was also a small point guard (only 5'10") who specialized in defense more than scoring.
The most important things for a coach is a player who can play defense, and a player who does not turn the ball over. The problem is, these things are not as noticeable in the short term. How often does your coach really get to see you play? Could his not playing you have anything to do with something other than not scoring?
My suggestion is, Why don't you become so good that he doesn't have a choice but to play you? It will require a lot of work and discipline, but it can definitely be done! Dedicate yourself to becoming the best.
Check out the School of Hoops (link below) on my site "The World of Hoops" for some great drills, videos, and other information about becoming a better player, leader, and teammate.
If you have questions or want to discuss a training program feel free to contact me at firstname.lastname@example.org