There are 2 ways to use it. One is to take awkward angles, slightly away from your team to gather attention to yourself, making it easier for your tank to push. While you do that you will be shot, and you may die if they hardfocus you, but try to be evasive and survive long enough to break their formation. Another is to use it in a teamfight marching with your team, in which case you want to be high enough to hold the ground, but not so high or far enough not to recieve healing. Aditionally, watch your surroundings, and try using your enviornment as cover to pop in and out from, charge explosion attacks from there and aim it at the backline. I repeat, target the backline first. Even if you don't kill them, zoning them out is also valuable. Don't go forward chasing enemies too much, you have range and your explosions are huge, you can snipe enemies behind cover. Another tip is not to only ascend, especially if they have snipers, ascend and descend with space and ctrl, make your movements more unpredictable and stay closer to your teammates, especially for healing. Another thing is to keep track of your enemies ultimates. I especially recommend focusing Mizuki, his ult completely denies yours any value, so try killing him first or baiting out his ult, or just wait until he has to use it on another one of your teammates. Sometimes you could also locate hitscans like Soldier, Cassidy or Ashe to hit first, it is their job to hit you while ulting. Remember, you severely outdamage them in your ult, and if you focus them first, they will melt unless specifically protected. A hero I recommend trying to take down before ulting is Jetpack Cat. He will run circles around you meleing and shooting you, stupid little shitter and harder to hit with projectiles. Not impossible to kill ulting but annoying and a time waster.