No matter how many works you submit, you're going to hit a wall until you make the decision to improve your fundamental art skills. I'm not trying to be mean or dissuade you from creating pixel art, in fact I'd love for you to become part of the pixeljoint community and get tons of stuff accepted. But until you improve the basic artistic skills it'll just be one rejection after another.
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No matter how many works you submit, you're going to hit a wall until you make the decision to improve your fundamental art skills. I'm not trying to be mean or dissuade you from creating pixel art, in fact I'd love for you to become part of the pixeljoint community and get tons of stuff accepted. But until you improve the basic artistic skills it'll just be one rejection after another.