everyone can hit gold just by admiting a few key mistakes
last hit better, dont spam.
dont dive 24/7 looking for blood, know your kill range and what you could get away with instead. and for peetes sake, stop chasing them on their turf without any vision, know the whole map and where they're heading before face checking their brush.
ward more
ask your team to group up more beyond 20minutes, for anything, just getting together will win silver
pick what your team needs, not what you want to play
proper runes/masteries /understanding of the champion before you pick it in ranked, i mean, just go to bots for a few games and go 20-0 before realizing if you go 5/3 on bots, maybe you shouldnt try it in ranked.
dont, I MEAN DONT, under any circumstance, mute your team mates, just resolve yourself from saying anything back, you can talk pure strategy and they'll respect you for it.
PINGS, more pings, they dont hurt.
make your minimap bigger, not screen blocking, but you want to watch it at least 1/10th the game to see positions (unless activley laning or in a fight)