Solo climb into plat?

Is it possible to Solo climb into plat without playing an extreme amount of games? I'm an adc main and i was able to climb into Plat once, by duoing with a good support. However i got demoted afterwards since i no longer have to duo with me and I cannot win with the autofilled supports. Is it possible to climb without a good duo? especially as adc? Should i giveup adc completely and learn a different role to hard carry? Is there a champion that's really good at tjust solo carrying?
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