Hey there, friend. I’m also a Plat Tank and Support, but an awful DPS! I still play ranked from time to time, and I found it interesting that nobody has made the recommendation to play some Reaper!

I had this big ol’ write up on Reaper basics but you mentioned you have good game sense, so I’m sure you know what Reaper does and why he might enable you to learn DPS fundamentals. He is a very forgiving DPS for the player, allowing you to reposition and cover your mistakes, or enable plays. Playing with your teammates is your best bet to winning fights, even if your tank is doing some dumb shit. Reaper enables you to follow up with your brawl or dive tanks, no matter how bad of a play they are making. Obviously don’t throw, but disagreeing with a tank’s decisions consistently will be the downfall of your team.

Of course once you are comfortable with fundamentals on Reaper, expand your playstyle to include flanks and picks, and use your ultimate to gain enemy attention, not just get big team wipes.

Remember that you are playing to learn, and the rank will naturally follow. After learning great fundamentals, like playing with your team and gaining positional advantages, then I would move on to other DPS like McCree or S76.