Stick to one type of arrows: Changing arrows too often is not good for accuracy. Use the arrow type that suits you.
Practice: Practice is the mother of skill when it comes to bow sight. It is not enough to pick a good bow sight to be a successful archer.
Adjusting the sight: Focus on adjusting the bow-sight by moving it up, right, left, and down in each shot. Make sure your bow and sight are correctly tuned.