Why can't i get out of bronze?

I'm a kayn jungle main and I would say I'm pretty decent. According to the website League of Graphs I'm in the top 14% of all kayn players in the world and top 17% in America, so I don't think I'm performing poorly, but I'm always getting these garbage teams, most of the time its my bot lane or top, and rarely mid, and I'm not neglecting ganking any of my lanes and would say I'm pretty good at getting my objectives. I would really like some ideas as to why I can't get out of bronze, as well as some tips. I'm open to criticism. Thanks! :)

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