What reading have you done? Had any instruction? It is important to know EXACTLY what you are trying to do with position, hold, trigger control and mental management. Otherwise you're just sending rounds downrange re-enforcing bad habits and making it difficult to improve later. You should not gauge progress by score. Progress is executing the shot better and letting score take care of itself.
It's a long road. It requires regular and frequent practice of specific techniques over a period of years. Just shooting a lot absolutely will not help you except by accident. Please don't be offended if I say that it sounds like you're doing what a lot of us, including me, did starting out: banging away because it's fun and wondering why we don't keep getting better. You need to get scientific about every aspect of the position and the mental game before you do anything else. Books: The Ways of the Rifle, The New Postion Rifle Shooting, With Winning in Mind. There are others. These are some good ones. If you don't have a good shooting coach at your side you need to start reading. Yesterday.
It's ALWAYS a game of plateaus. We get a little better,slip back, seem to stay in one range forever, finally creep forward a little. That's just the way it is. There ain't no "breakthrough" where you finally figure it out.
Get to a match. Why haven't we seen you at Benton yet? Highpower match Sunday afternoon. Lemme know soon and I'll load some ammo for you and tell you all my secrets while you're here. It won't take long.