Next Rank 4 Champion

Whinchester87

I already have 4 rank 4 5 stars and they are corvus, blade, starky, and magneto. I have just got cavalier title and am looking into mare variants style content as well as 6.2. Im gonna grind at the 2019 crystals this month to get a chance at a 5 star or 6 star doctor doom. I would also like to Explore act 5 so any tips would be nice