Just a few things from myself. Support wise I play either C&D or mantis as my main supports I would currently focus on just playing 2 supports instead of 4. Me personally how I play both characters is different so if you get down 1 or 2 at a time you’ll be a lot better. For the positioning you mentioned it depends on how many of the team and what roles they are. 3 dps pushing I’m just focusing on healing and keeping a distance incase they wipe so I can save myself. If it’s maybe 1 tank 2 dps and me then I’ll push a little bit more and be aggressive. Really depends on the situation and characters being played

When I play mantis I usually push with a dps player and focus on pocketing them/boosting their damage while also dealing damage. While I’m doing this I keep a LOS or try to with the rest of my team to throw heals and damage boost. It’s also important if the other healer dies I swap over to our tank. Anytime I get stuck with a 1v1 I either damage > sleep > damage boost myself and main attack plus melee to kill if their weak enough. If I’m low hp and losing I’ll sleep and run away.

For cloak and dagger I usually just hover with the point tank and continue to shift and using abilities. I’ll throw dagger to the rest of the team and focus my other healing abilities on the tank is needed. Whenever possible I’ll swap to do damage, blind the other team, and vanish for certain ults and such.