I agree with a lot of what has been said. Yes get rid of the hybrid and have three wedges. Master your short game by practising your chipping, pitching or flopping. Don't necessarily need all three shots, I just use the flop shot.
You seem to play the same course day after day. Mix it up, try all courses whether you play well or not. If you keep playing the same courses you will get stuck in a rut. Learning all courses widens your skills. On that point, you haven't played any alternate shot games. These are fun and wont' affect your average. You'll also get helpful advice from other players. Some of them will understand what you are going through. You are not alone, we've all been there. Always best to join a good country club. You'll be guaranteed good alternate shot games and get helpful advice in the club forums.
Take notes, course management can help your game. I'm too lazy to make notes, but I probably need to if I want to improve. Use starter balls for a while, that will help you when you play with your proper ball. Concentrate on one aspect of your game and improve that.
Finally, have fun, remember it's only a game and your average and tier are only one part of it. Hope that helps. Happy golfing.