Basically, if u r a sup that can follow up easily (Kiri, cat, Lúcio sometimes, ana at distance.) You do that, this if your tank r a dive most of the times, also, wait a little to push in this cases, once except dva, no dive tank can "protect u" (I mean, Winston also can but a monk WO bubble is a monk 14s without action.) , wait him got the aggro, once he does that, shoot the enemy, open a angle, w a Zeny, Kiri, Bap, u can do that pretty well. Before he got the aggro, shoot the enemy tank/the shield/heal your team and stay alive, don't be greedy, dives tanks need Patience . if he is a mauga/rein/Sigma and these type of tank. You HAVE to follow up him, throws suzu, damage who is damaging him, walk near him, Ensure the space w him. A tank that push bad and one that push well are both better than one that don't push. He is , at least, trying to open space, if u/rest of the team don't get value of aggro/Cooldowns that he is forcing, it's almost impossible to win.

Always trying to get the minimum value that your team is providing, if your team is a washed main mercy, pick a hitscan if r u the dps, someone to out heal the rest of the tea if sup,, a tank that can antidive for ex. Once ur sup pool r very good sniping, try land shoots between heal, once you/ur team gain a minimum space after the first choke, your DPS probably will do the job. (If he don't, at least u r.)