Need a bit of help to get better at ranked (currently bronze 5)

Hey guys, i'm not that good at the game at the moment, i have my games where i carry but others i cant, i know its bad to blame it on my team but i have been getting trolls/feeders last few games, my win loss is 4 wins to 7 losses. I would really love some opinions on what i can do, champions to play, attitude to have ect ect Thank you :D
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