Sometimes what you need is to have someone who is a solid shooter in the type of shooting you are doing watch you, and then be able to give you some pointers. If your form is bad, you can have all the effort in the world and still be frustrated. Other times the specific gun you are using is not capable of going beyond a certain point or possibly your loads need to be tuned better.
When it comes to set-up and shooting form there is a list of things that you need to do every time and they need to be repeatable. As a friend says, "You need to train your brain." with good shooting skills. You also need to be patient and realistic in your approach.