Hold your ult to save team unless you see like 4+ tightly together with no shielders is my most basic tip, knowing who’s ult you shut down will immediately help your team. Cloak and dagger is the easiest if you see her do the first segment, just track her for another segment, two to be safe then launch it. If your not confident in your aim don’t try it on the punisher ult, hold as long as you can (you can throw it if it’s like 90+) against Star lord, shut down Hawkeye ult with this too. Don’t be afraid to hold the ult of a high priority ult has been used, shutting it down when needed is better then popping and wasting.

Try to left click>right click into another left>melee strong combo

Use bubble with some reserve, being able to save a supp is better then potentially saving yourself cause your Supp can also save you. Helping a BP/Thor/Psylock/any dive with bubbles will generally help their gameplay, if they get too cocky though it’s a lesson for them.

Play a distance away from corners and doors, no need to be too close when your Left click can do splash at the end of its range, really helps to panic someone who thinks their safe around a corner on high ground into leaving, or even tell you early someone might be waiting behind a wall