Dodge clear losses at champ select.

Else, you have to win more to make up for the tards you got stuck with.

Boring, I know. Sorry.

If this isn't your problem, mid and jungle seem to be the best bet to completely carry game (early, mid, late).

And the truth is, there are people out there who are too bad to be carried (a.k.a. elo hell). You have to hope the other team has more of these guys than your team; luck of the draw.

Step 1 - Realize that you cannot win every single game. Yes, there will be that game with one feeder and one afker. You won't win it.

Step 2 - Realize that if you are winning 50% of your games, then you are at the correct ELO.

Step 3 - If you are winning 50% of your games, try to figure out why you aren't as good as you think you are.

you get better at the game

Buy wards, a lot of wards, they won games, really.