Is there a way to let the game know you're trying a new role?

I'm primarily a support main, that's where I'm comfortable. I think I'd like to try filling though, to get some variety in my games. Trouble is, I really can't play any other role, and if I get matched with the teams I usually get matched with I'm going to get slaughtered and flamed and reported and it's not gonna be a fun time. I don't suppose there's a way to get matched with players more my skill? Probably not, but I thought I'd ask
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