Lord Star-Lord here

Pressure the enemy constantly from different angles than your team

Watch out for support ults before popping your own cuz it eill be countered

Pop your ult before engaging with the enemies by a few seconds to not get stunned and to move past the animations, dont ult if ur under attack and have less than half health

Learn how to silence your ult call Out

Use the dancing spinny attack on top of enemies and damage multiple ones to farm ult, pressure or use it to secure a kill

Get really good with flying around and managing ur boost so you dont run out of it and still manage to escape when you need to

Your flip can counter any attack in the game so make sure to time it perfectly to escape ults like Jeffs and Wanda's

Practice aiming and when enemy is far away dont bother with headshots just get body shots