@Mahamoti You have received a good answer from @D_DI where to focus on. Stable your 4 star heroes first. Afterwards you can work on your 5 star heroes.
Wilbur and Jackal would be my first options to level. If you could max Musashi in short time he could be an interesting option. But may sñow your overall progress.
Hi,
Def Li, Kash, Kiril, Gormek and Figard
ATk add ,mix in Wilbur, Jackal, Proteus, Falcon
You might want to sit on the 5 for a while, also you will needs a couple of 3*’ team along with a few 4*'s.
I’m not a fan But Wu seems to be a required titan hitter.
Fun to be had.
Wolf9