Save your Fireball when Seris is healing her tank. Combining that with Cauterize on your flamethrower, your tank will get healed less, so he will require more healing attention, as such, reducing the survivability of their tank and other teammates.
Salvo does insane damage to your shield. Wait for Drogoz to use his Salvo before pulling it out. If his team is not focusing you, you might save your shield if they decide to push.
When Torvald ULTs, you can use Pounce to reverse the knockback, saving you from falling into the pit and gain a ridiculous speed needed to get back to safety.
Versus "Artful Dodger" Maeve, don't rush to use Crippling Throw. Wait until she will use "Nine lives" to heal herself. Only then Root her.
This way, she has her "escape" on cooldown and can't survive 2 second standing still.
Requares good aim.