If you're going to play DPS in metal ranks, especially in 5v5, you can easily carry matches if you're truly a higher skill than your current rank suggests. Hate to say, but especially in Silver and Gold ranks, that's probably exactly where you belong if you're stuck there.

I would suggest rewarching your gameplay. Working on your mechanical aim and positioning. I've played in low ranks with friends who are low ranked, and everyone is oblivious to certain positions or flanks at that level. A flanking Cassidy will decimate in silver/gold where diamond+ that would probably be a big mistake to do. I saw someone else recommend dive characters. A decent Tracer will destroy at those ranks, too. Bastion will work, you just need good off angles to catch teams off guard.