How do supports carry the game?

I'm not new to LoL but I did start focussing on ranked (currently Iron I). I'm a support main with mostly Lulu, and my win rate on her since midseason is currently 48% over 27 games. Had some amazing games and had really, really bad ones. I do know my champion very well, but still can't always get my adc to get some kills. I don't wanna blame anyone else but me, but I don't know what I'm doing wrong. I try to work on vision, try to communicate with my adc, know when to buff and when not to, but it can still be hopeless at times. I'm not some godlike player and I do make mistakes, but when my adc isn't fed, what can I do as support to still be of value to the team? (besides warding, etc)
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