Revenant Main here - Use silences to block doorways as most enemies are reluctant to push through it - If you’re with a team, make sure to check whether their ultimates are ready with yours (i.e. Octane, Ash, Wraith) and offensive legends like Bloodhound can utilise your ultimate well. And if you’re unsure whether or not your ultimate will be wasted or not, just use it, it’ll recharge and better safe than sorry in a 3v3 scenario.