Ok I'm jealous.

Hi, my friends have hit GM on every role except for me. GM 4 on tank. And I kind of want to walk my way to GM in DPS and Support. Here's the catch. I'm terrible at both but decent. Not for a Diamond DPS / Support. And my friends are some kind of "QP warriors" and they don't want to make new accounts to help me out. Should I solo queue my way up or just give an attempt to T500 and get rolled?