Wilbur first, I suspect you will try and get Zim, with your current roster, Zim would be able to take you to diamond arena. Your raiding party is Zim, Boltusk, Wilbur, Lancelot, Kelile ( 3 / 60 ). The team is very successful against Guinevere tank.
My current raiding party is. GM (replace by Zim if I get her), Boltusk, Wilbur, Lancelot, Kelile @ 3/60 ( waiting to max Marjana ). Check out my YouTube channel, ( E & P : SandMan ) you can see that I use mainly monochrome red, and if I want to mix it up I put Wu in, and leave Kelile on the bench.
Here is an example, I hope the practical example help with your progression. Good luck.