Or you could just play a champion you play well, your not gonna carry harder with mid if you arn´t better than the enemy mid, which quite frankly you probablly arn´t. It´s not true that you can´t carry with support, it can actually be easier to carry with supports since it´s easier to outplay your opponent as support because nobody else actually bothers learning how to play it.
How to win in solo queue:
1. Outplay your opponent and gain an advantage for you or your team.
2. Snowball your advantage to win the game.
This applies to every role, you guys are talking about step 2 when the truth is that if your "stuck" in low ELO you probablly don´t have 1 covered which means you can´t do step 2.