Way's To Improve My Art Style?

Hey i'm a aspiring manga artist and I want to improve my art style my brother said he started drawing when he was five I started at seven and it took me only four years from a rookie or beginner to be a novice i'm in 8th grade and when college come's I want to send my work any artist please help I can't beet my brother we had these drawing contest and he always win how can I evolve my art into it's last form it's like it's right there but hard to

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