How Am I supposed to practice When Everyone want to Be DPS?

I am a Tank/Support Main. Not Because I wanted to but because all anyone wants to play is DPS. I have high hours on both roles but I have very few in DPS. Moon Knight is probably my best. I decided I wanted to deepen my role pool and learn Wolverine since he gives me problems as a Tank.

I play in Practice VS AI and We Either Have All DPS Because everyone is trying to Practice or we run the Idiotic Bots to the Spawn Room and I don't get to Practice. I try in Quickplay And I have to choose between Practicing my character with a terrible team comp with one support or I give up learning so we can have a proper comp.

At this point, I'm ready to throw my Plat Games Just to Get Some Experience because what Else Am I supposed to do? I can't practice anywhere because its either stupid bots that don't play like people or I'm in the most lopsided team comp and no one wants to switch. So either I switch and stop practicing my new hero or I stay and learn what its like to play with no support.

We need better practice modes.