Please help (dance advice)?

I am 15 years old dancing in a cl with 9 year olds. I used to be a wonderful dancer, until i switched studios and was really put down by my new instructors. I lost all confidence, flexibility, technique, and almost lost my love for dance. I want to be a good dancer again. I want to catch the attention of my instructors. I want to be flexible again. I want to be able to have correct posture for ballet. I want to be able to pick up choreography quickly. I want to be confident. I want to be at or above the level i should be. I want to be a good dancer again. Please, any and all advice will be appreciated. Thank you.