Advice on how to stop taking Overwatch so seriously and have fun again?

So over the past few weeks, I've noticed a significant decline in my enjoyment in playing Overwatch and I've managed to pinpoint the exact cause: I've been obsessed with my win rate. I'm not an amazing Overwatch player or anything, but I pride myself on being pretty decent, and it doesn't feel good when I go on a losing streak. But it's gotten to the point where I'm too focused on my win rate to the point where I'm not enjoying myself as much anymore, even being low-key kinda toxic sometimes, which I'm ashamed of. Does anyone here have any advice on how I could stop focusing on winning and start having fun?

Edit: Probably should have clarified this originally, but I don't play competitive. I'm primarily a quickplay player.