How does your oz make 40k damage?

My build has 69/140 from polar star and 4pc golden troupe, atk/electro dmg/cr. The damage is only 12k and even in an aggravate team with nahida and kazuha or an overload team with benny and chevreuse there's barely any improvement.

The mentioned supports are at their best except for nahida because I just got her today.

Where have I gone wrong? What makes yours OP? Any tips would be greatly appreciated.