short ver.
stop being bad and win
long version
You are bronze for a reason, think about what you are doing now and what you need to do better.
I shit you not when i say just as silver ( which is shit) i can walk out of bronze ona whim and i have done it multiple times to prove to my various bronze friends that it is clearly possible.
i do it in1 of 2 ways but im better at the jungle route.
watch a lot of cowsep and i mean a lot. learn to farm fast and hard. learn to itemize. then proceed to kill litterally everyone. the concept behind the master yi carry is you at no point in time will die early game meaning you cannot feed ( if done properly ) and when you hit 6 your gank are so hard will will atleast net you a summoner or a kill. which at that point you begin to tilt atleast one lane turning it into a 4v5. if you tilt top lane then they become useless you proceed to the next step. kill their carries. no matter how broze an adc is. if you kill their carry before they do damage , idc if they play leauge on a laptop trackpad, your adc will do more damage which will more then likly win the team fight. you snowball your lead by killing the carries and split pushers who dont understand how to farm http://plays.tv/video/5754d3559ef997b1e4/how-to-abuse-a-downed-towers-and-no-vision?from=user
if their top laner is useless and their ADC is dead you're fighting a 3v5 and if you lose that then someone on thier team isa god.
the other option is to get really good at adc, i use to cheese leads with twitch and quinn then use Superior positioning and farming to extend my lead and take games.