please help me i want help

Ok so i was gold 3 about 4 weeks ago and now i have dropped down to silver I from g5. I cannot win any games even if we are ahead the enemy team just seems to be a lot better. Even when I deal most damage, or play a tank we lose no matter how hard I try. I played pretty much most of the champions I am good at and no success.I play solo duo if that matters and my mmr is really bad because of the amount of losses I have. How do I climb back to at least gold V with having atleast a 50% win rate?
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