Switching roles?

So for the majority of my league experience i've been an ADC main, i've never gotten above silver 3, but still.. anyway, i'm sick of being seen as "a toxic ADC player" and am officially thinking of changing my main role to support. i wanna be able to help my team more and have more impact on the map, but i'm not sure how to be a good support, aside from what I, as an ADC, sort of expect during laning phase.. and i feel like, in laning phase, i can be a good support to an ADC, but i'm not sure how to play support well once i need to start roaming and stuff.. any tips?
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