My account

hey guys,I'm silver 5 player for over than 260 games and iam stuck there so i decided to take a break and then my brother(he plays LOL to) asked me to play on his own acc to get him some ip so i played ranked on this account and i boosted him from bronze 1(0 points) to silver 4 (45 points) in 1 week while i can't get my acc out of silver 5 for months and i mean like the same person is playing but in anther acc so why can't i do what i did in my brother acc in my own?! so i want to hear your thoughts guys and i wish someone could help me by any tip or saying why is this happening to me.
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