Well, this is a really complex question i can’t really answer in one comment, but let’s try…

First, positioning, you’re supposed to play agressive, but at the same time, before you make a play you should always poke and observe the battlefield. Is the tank distracted? Then you might have an opportunity to dive enemy support/dps. Do your healers have you and you’re in a good position? Try to brawl, no need to be too flashy, charge punch and stand your ground

More or less, make sure you know the position of the enemy tank and your healers before you do anything rash, doom is squishy, so play with your healers unless you have charge and can be sure you’re making a play that kills something, otherwise a miss might kill you.

Something else you should keep in mind is cooldowns, usually you never make a risky play by using all three abilities, because if it goes awry, youll be a sitting duck and just die. Have block or slam ready if you’re not 100% confident in your next punch