Ranked advice

Hey everyone. I've been playing Ranked recently but I fluctuate between Silver 3 and Silver 2. Lately I've been playing a lot of Galio support (I main support in general) , but my last 6 games have been loses despite having a huge early lead and getting my carry fed. What can I do to have more impact later? It feels like no matter what I do and how much I try to peel the game is never in my hands.
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