How does one rank up as a support main?

I'm utter crap at other roles, and have been maining support for as long as I can remember. But what is annoying is that as a support you have to heavily rely on how well the other laners and jungler do to win a game. It's really inconsistent. Does anyone have any tips? I promised myself i'd get gold this season but after playing ranked for about 3 weeks now i've barely scraped silver V.
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