How do i climb above gold as adc?

Hey so i been stuck in gold for quite some time now and i need help. Last season i managed to climb to plat v by playing jungle, mainly kayle before the nerfs to her damage but i quit league shortly after that for a while and i started playing again 2 months ago. Even though i climbed by spamming kayle my main role was actually adc. The problem i had was that as adc i never felt like i had control over the game which is exactly what i had when playing jungle, with jungle you potentially have a lot of impact early/mid game since you can gank and engage first or second in skirmishes; and depending on how well you play you can set the course of the game ( couple that with kayle late game and you can't lose).

Kayle really used to fit my play-style because i didn't have to be afraid of getting bursted the second was in range of multiple enemies, now i know that regardless of what position you play positioning is really important, but in soloq there is almost no coordination and team fights essentially boil down to who can output more consistent damage in the shortest time possible. Now if i'm playing adc i cannot afford to wait in the back line until for example zed, annie and nautilus blow their cool downs before going in to deal damage, because by the time that happens half my team will be dead or half dead and the fight is technically lost. I basically feel that as adc i'm dependent on team compositions and decent engages for me to play well, and i absolutely hate this, i want to be able to carry games regardless of the picks and regardless of how good or bad my team plays. I'm aware that dominating my lane is key to success here (as well as improving my mechanics of course but that just comes with practice), dominating my lane is the part i struggle most at. This is because I feel that if my support is bad i will not be able to win the lane and no i don't want to duoq with a support because the system is designed to match your team mates with harder opponents if you duoq and 7/10 my team gets completely wrecked.

So my questions boil down to these; what is the difference between a platinum and a gold adc, is it even possible to carry your self through gold and above by solely playing adc and how do i control the flow of the game as adc since i can't be the front line. Also i don't mean any disrespect but unless you have climbed to plat or above by playing adc in like 90% of your games please don't comment. If your wondering about my game knowledge, i watched all of the clips from unswlolsoc YouTube channel on how to adc and team fight, if you know anything that he hasn't covered then please point it out to me.

Thank you for reading.