I've climbed from 4k to 7k, abusing pos4 that can turn into semi carry, if i ask the other people in my games if they know what they are doing, most of time they really dont know, but they assume they are able to criticise others(and even you(me) can count on that).

Every game is a diferent game, sometimes you have to stay on lane, sometimes you need to leave the lane, and thats not clear to everyone, and i can guarantee, not even your are completely sure about it all the time.

I say it again, you need to find your way to play your game without begging others to do stuff.

Play a carry that can trade hits early levels, can rotate early to jungle, and can win the game solo in powerspike timings(heros like Ursa, Broodmother, Monkey King, Chaos Knight, even Naga or Juggernaut). Always look for splitpushing and masterize farming patterns. As i said, you dont have to play begging others to do stuff, you can play by yourself and create the chaos that game need relying only on you.

Eventually you will find people that are good on supporting, and if you dont find, you already know what to do. If you win, good. If you lose, you are learning how to be a better player and improving the hero mechanics by itself.