I assume you are asking for the mechanics to do well instead of squad comps.
High damage AoE, high damage single attacks, and high speed to topple the tank regularly, and build up the damage while it's down. That's basically what you need.
i got 3mil with my zCody, zFives (zeta not necessary to do well), Echo, Sergeant and Jawa Scavenger. I've seen people do 5mil+ with it on reddit (RNG obviously explains how they got so high). Go for a crit build on everyone and stack as much speed as possible on Cody and Scavenger, then have very little speed on Fives, Echo, and Sergeant so they keep the buffs from Scavenger longer.
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High damage AoE, high damage single attacks, and high speed to topple the tank regularly, and build up the damage while it's down. That's basically what you need.
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