why am i not ranking up?

League feels extremely boring and easy right now, as i repeatedly keep stomping my lanes earning several pentakills and s grades, i dont ''win'' the game tho ( destroying enemy nexus ) but that is completely outside of my control, seeing as i would need at least 1 or 2 teammates that doesnt hardcore feed, which isnt possible on my account, so i am asking what am i doing wrong and how do i improve?
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