Climbing out of low elo is difficult because it is hard to 1 man carry a team. if you are blowing everyone out of the water KDA wise, then once you die in a fight your team is toast without you. It is also hard to coordinate or perform good plays with low elo players because they dont have good map awarenes, tower dive knowledge, wave knowledge, or know how to coordinate ganks. I find it best to climb out of low elo in champ select itself. if you have one of the last picks, odds are you can carry the game with a good counter pick. If you have one of the first picks, i would see who you could play that would not only get YOU ahead, but a play style where your team could also get the edge and help you out. Because come late game no matter how fed you got early as one person you cant 1v5 like you can early. So you need to think about how you can get these low elo scrubs ahead of their opposing laners/jungler so that they can pull their own weight come later in the game, instead of you having a team of deadweight players on your shoulders cause you took all the kills and cs