How am I supposed to operate in this system as a mid/support player?

My best role is mid, and my second best role is support. If I just put mid/support, I get support every game. So either I accept that I'm only allowed to play support, or I have to put some other role that I'm not good at in order to increase my chance of getting my main role, and accept that I'll lose more often because of it. The hell am I supposed to do?
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