Doing well in games but always losing?

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Well, over the course of today I've encountered a few things while playing league. I seem to carry/do well in almost every single game however always end up losing due to bad luck or teammates (yeah, ik, excuses excuses). I admit I do play a hell of a lot of league but the thought of being stuck in bronze forever doesn't really appeal to me. Does anyone have any tips for climbing? I do play a wide-range of champions and roles as sticking to one champion bores me. All help is appreciated :) <3
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