How to win more as ADC

I never played that much adc but last days I really got intrested and started learning matchups,champs and that kinda stuff. But I lose many of my games I have about 48% win raye in 25 last games. My farm isn't bad but I fall in late game. Also I sometimes do great but my autofill supp makes stupid plays. How to win with bad supp and how to win more games as adc in general,should I only spam the role until I acomplish good win rate?
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