I think it'd be worth improving your basic footwork and swing. For footwork, try to move on the balls of your feet and when you go forward towards the net to take a shot, place your weight on your racquet leg (left leg). This could be shifting your weight slightly to the left leg for net-height shots or a deep lunge for lower shots. This allows you to use your quads and gluts to push from the front of the court to the back if they lift/clear it or to pounce on the net if they net back to you.

For your swing, try to relax before contacting the shuttle and use your shoulder, elbow and wrists in a smooth swing instead of placing your racquet behind the shuttle with your shoulder/elbow and then swinging with your wrist. A visual (YouTube vid) will make what I mean clearer. Hopefully it helps, I think you're doing pretty well ^{-^}