I need some advices from ADC mains

Hello, I am jungle main whos jungling since the very start at season 3 and my 2nd most comfortable role is ADC. I am not bad , my CS is fine, I know matchups, I know how to follow my support and I know haw to position myself later in the teamfights but, I am really struggling when my support isnt doing as much. I aint gonna say "my support sucks", I am asking for advice what to do when my support is not good at his role? I play Varus and Sivir mostly, are there any picks that are more independant during laning phase? Every single time I get my second role I feel powerless and I really want to improve it. Season is starting in 3 days and I dont want to start my ranked jurney again with only one role in my pocket.
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