Explain to me what could have been done to win this game

https://ibb.co/nPDH1J So, i would like a detailed explanation of how i could have won this game please. How does platinum 5 balance out silver 2 in gold 5-gold 4 game? I would like someone to explain me how is this fair and what did i do wrong to lose this game for my team so i could improve myself and win onesided stomp games.
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