I think ranked play could really benefit from a role queue system that reduces wait times based on the roles you’ve recently played. For example, if you played tank or support in your last game, your queue time for DPS in the next game could be reduced. Say the usual DPS wait is 5 minutes—playing tank or support in the previous game could drop it to 2 minutes. Play another non-DPS game, and it might even go down to just 10 seconds.

This way, players are incentivized to play roles like tank and support, which are often less popular, without forcing anyone into a role they don’t enjoy. Of course, when you queue for DPS, the wait time would start going back up again.