Tips on playing ranked?

I started playing league just half a year ago and this season I decided to start playing ranked, I did my placements and got placed in bronze IV, i guess it's an okay place to start from, and I really need some tips on playing ranked, I play mainly mid, adc and occasionally support, but with all three of them, maybe mid a bit less, I feel like my victory is not mine, like I don't matter on the overall victory or defeat of the game; I don't mean that I always go 99/0 everygame bit I can't carry, but that I feel just useless for the team, I can play a roamer like twisted fate or a straight up burst mage like viktor but I always feel irrelevant to the game and I don't know what I am doing wrong. Thanks in advance and sorry for the long and confusionary post
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