I play for 12 hrs a day and im bad ? help!

I play for 12 hrs a day for the last 2 years and I'm only s3 . Why is it that I'm this bad at this much practice a day? People have jobs and play for less and are higher elo than this . I'm 16 and don't go to public school don't worry I'm not 46 and play 12 hrs a day . Ive watched so much videos on how to get good and raise my elo. Yet none of them worked I heard it all ive watched streams. IWD,Yassuo,faker,Voyboy ( jger esp cause that's my main) plese tell me what diamond players do that I don't ?
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