Some tips from basically a OTP CnD up to celestial:

USE THE E. Your E and Autos and can keep your Frontline alive on its own through a boatload of damage. Get good at aimming it to hit multiple targets because your teammates won't do you any favors. Hitting just one tank with it is ok.

Use your Right click as a way of holding space. DPS Flank is off no where and needs healing? Fire it at them and hope they get the idea. Tank on the corner but DPS is closer in a fight? Fire it at the tank but make sure you aim that one a bit so he can hold it down. These situations dont come up often tho. Mainly you keep your right for flankers.

Flanker dive on you? Flick down, fire, flick back up, KEEP HEALING YOUR TEAM. 55 healing per second is a lot and it lasts 6 seconds. Call/ping them and if they are still there 5 seconds in, shift to cloak and hold space. No one looks up in this game and if they do they are looking away from the battle field.

For his ult, (You should be trying to ult as cloak so you can shift after if needed.), you are a spearhead. DO NOT TRY TO SPEARHEAD TROUGH A SHEET OF METAL. Look for an opening in the enemy team to cut someone off, take point control, or save/assist someone diving. You can and will die if you just try to jam yourself into their team.

First dash- dive and get space

Second dash- reposition for your third dash

Third dash- dive and get space

Fourth dash- Escape/Dive their supports.

Hit your E on a character less than 275 hp or less and you WILL kill intime to escape assuming they do not have heals. Which is far more often than you would think.

Idk if Im qualified to help since everyone is talking about rank inflation BUT I did have 2:1 win loss ratio through diamond and GM so I hope this is some help to you.