R1 is classic roleq Dva but you can apply those tips for any round up to R7. Actually you need to scale for being a lobby admin and more you got item and scale money more you can be arrogant :

This are ALL THE THINGS YOU NEED TO DO INGAME to be the best Lobby admin Dva. There is no secret just try again and again and learn what the best for you in any situation. i'll give you all the tools and tips for specific situation NOW ITS YOUR TURN !

• Play main and face enemy Tank shoot him and [Defense Matrix] him aswell for Cut the heal if possible vs like Enemy [Ana] [Juno] Etc. Basically any support you can eat healing with [Defense Matrix] and also make him losing space for your team. You need at this moment to already think about your next action ( Don't worry everything you need is write below )

• Abuse High ground with DVA as much as possible since [Boosters] cooldowns are very short, if you can make everyone in enemy team watching at you and stay alive you can just having infinite value, taking a lot of space for your whole team and it's also mix very well abusing high ground with [Focused Fusion] POWER since you have way more range to hit.

• Wait for an opportunity to punish an enemy out of position in your backline or in their backline, the most important thing to know is to measure RISK/REWARD means it's better to go in with [Defense Matrix] atleast in 50% charge and [Micro Missiles] UP because you need ressources to dive. The key is to ALWAYS stay alive no matter what !

• Protect your backline. YOU CAN DO EVERYTHING AS DVA vs match up Like Monkey/Genji even a Reinhardt who charge your backline , The key is to understand as Dva if you can trade their backline and kill them faster than the enemy team or you can just back and help your team and also punish the enemy in. You cannot complain about everyone is dying vs dive if you don't help them.

You litterally need to always doing anything when you are full HP and full cooldowns, SHOOT AND MAKE DAMAGE ON TANK, PROTECT THE TEAM, DIVE THE SUPPORT AND DPS, TAKE SPACE CREATE CHAOS MAKE EVERY ENEMY LOOKING AT YOU AND STAY ALIVE. You can't be passive as DVA.

VS BEAM only : Against [Zarya] or Multiple beam in one match like : [Moira] + [Mei] + [Winston]

Take [Refraction Armor] + [Armored Vest] round 1