Assuming you don't have more important targets, hold your ult for when Vivian uses hers. Tag her with a bit of damage, then ult. Be wary of supports being nearby, or if she's running the Scapegoat card, as either will likely shut down the kill

Maeve is a tricky target to hit with all of her mobility. Try leading your shots to improve your ability to hit her.

Pip isn't very mobile when his Weightless is down. Try to catch him just after it wears off.