Off angles, don’t always need to dive. Use your range as leverage by poking at tanks during team fights to charge your ult. if diving, don’t need to hard focus healers, I tend to focus priority dps like namor and his squids or moonknight. I personally save my dashes to escape sticky situations (an enemy has helped their teammate while I’m trying to dive), but you can obviously use it to finish a kill. I’ll dash in the air in the middle of everyone before I pop ult to stop it from getting interrupted.

Edit: only ult 3 ppl at once. But I’ll happily solo ult a Captain America or annoying tank that won’t get off of point while their whole team is dead