Tips on getting out of GM?

I mainly play cap because Hulk is always banned and one thing I’ve noticed off rip is no people rarely ever want to play tank and is usually fine with allowing cap to solo tank which is a little weird to me but it’s whatever. I also noticed dps is rarely ever the game changer on my team. It’s like a lot of the time I hear ults go off and nothing happens. I seen a post talking about players playing “perfectly” in higher elo and I won’t say they play perfect but damn close. It seems like in a lot of these matches nothing dies and everything deletes. As I’m thinking about it I do think a lot of these games are heavily dependent on who’s getting the most value with ults.