Not complaining, I just need advice please.

So I was banned for being toxic, and had to start over. I've accepted my ban and am trying to reform. The issue is I was forced to start Iron 5, as all new accounts have to climb from Iron now. This must be my punishment, because it's really really brutal. Almost every single ranked game I get an afk or a troll. I was a plat 3 Zyra Support. I've been trying to climb as Zyra support or mid, but I feel like no matter how well I play, if I get a troll team I can't carry. So my question is, should I bite the bullet and just try to learn a new champion/role, like a bruiser or assassin that can carry? At this rate I will never be able to climb out of Iron and it's extremely demoralizing.
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