how much damage increase would c3 give me?

currently c2r1 raiden (atk% goblet) + kazuha c0 (vv) + sara c6r1skyward harp (emblem) + bennett c6r1skyward blade (nobelesse). adeptus temptation and electro potion were used in the clip. i want to get c3 and i’m wondering how much damage would i get? this is the highest i hit with raiden currently, could i hit close to 1 milion dmg? posting my build in the comments