How to get out of bronze solo?

For the last view days I am getting games where my team mates starts to troll, or ga afk. And if that doesn't happen they surrender at 20 minutes. It is impossible for me to get solo out of ranked, the most normal games are going fine and that are the games that I do win. But even though if you are in the bronze division and you play normal. You still get matched up with thoose people that also play in ranked and go afk and troll. That's the reason why I want to play ranked and get out of bronze. Is there anything that you can do to get out of bronze solo? (Without having those people that troll or go afk.) Hope to hear from you all!
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