How to become better adc?

I am decent at all roles but when playing adc i am soo bad ,my farm is bad,I don't know when to trade or how to position correctly. But i want to start playing adc because 90% of champions i like are ad carries(Jhin,Lucian,Draven,MF...etc.). Can you drop some advice who to play to become better and some tips i would be greatful.
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