Honestly, no matter how well you do in your lane, it does not matter if your team is garbage or a bunch of monkies. If you don't win your lane by more than 20 kills, good luck (this is an exaggeration- trying to get point across).
Only ways to win league at this point:
- get insanely fed to the point you can 1 v 5 them
- have a decent team that does not suck balls
- hope their team is also full of monkies
- hope their team does not know how to close games or group or rotate, etc
- hope your team does not feed anyone
- hope your team does not troll, flame, afk, or int
There are just too many variables in LoL to be able to climb effectively unless you are faker-level god-tier skill level mechanically.
Because there are too many times I go even in my lane or win by a little, where the rest of their team comes running into my lane and fucking me over and over until my laner gets caught back up while my team is monkeying around, dying off something doing who knows what and being ultimately useless.
The thing is, if riot has their matchmaking done well, games should be close and no lane should be 10/0 7 minutes in the game... While I always have a team who fights every other minute, god knows why, even when they are so behind, they can't just wave-clear and go even in their lanes, to give me a chance to carry.