For people trying to climb low ELO bronze/silver/gold
Just learn to last hit. Seriously. People in these elo's don't know how to farm and if you do it won't even matter if you get kills because you'll be massively ahead of them in gold simply through farming.
Bad at CSing or on a champ not good at last hitting? Run minion dematerializer. This rune is amazing and will improve your last hitting by a fuck ton. Still bad at CSIng? Go into a custom and learn to last hit.
There are so many people that claim to know how to farm but they really don't. So many people miss farm and just say oh well I got the rest.... No, that 1 piece of farm adds up. The less farm you miss, the bigger the lead you'll get. There is no "oh well" if you want to climb if you are constantly missing random CS every wave.
CS is extremely important in this game, if you don't want to learn it I recommend playing Heroes of the Storm or stop worrying about ranking up because you obviously aren't serious about it if you aren't willing to improve.
It's not your teamates holding you back in these elo's, it's you.
Also to fello support mains, learn to pressure a lane if you want to climb. Being passive while the rest of your team feeds isn't going to win you games. Crush the enemy bot lane or else it's going to be a 50/50 on whose team is worse. Carry hard and if you get camped, then you can play passive and turtle.