Learn the game mechanics like aiming, positioning and movement. Learn to deal eith heroes that you have problems with fighting against. Learn to use your surroundings when you play pharah for example. Learn to communicate with your team and try strategies.
These are the tips that i used for myself getting from low/mid plat to mid/high masters.
Stop maining supports and shield tanks down there. Start playing heroes like Reaper, Pharah, Hog, D.va more often. They are the only heroes that can get you out of bronze.
Bitch plz I got out of bronze using Zen now I’m mid diamond . If you wanna main support play Moira and Tank Play Roadhog and learn positioning and decision making as you can carry your team with ease. I saw above comments about main DPS and Don’t main support that’s fuckin bullshit. A good support is really rare in Bronze. So keep playing support and find at least 2 friends to play with . this mentality of Don’t Main support in lower ranks keeps you lower rank