4 out of 5 ranked game recently have afks in our team. How to escape bronze?

Some people didn't even play the game, leaving the game since the loading screen. How can i prove myself and get higher with so many afks? That is a unfair game. I get about 1 afk about 4 or 5 games, I know the punishment for afk is becoming more serious. So you're telling me to prove you're silver or higher, you have to win every single game with 4vs5, teammates with 0/20 score and a extremely fed enemy in bronze?
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