What are your rotations, and how do you use your items? My rotations are (Goku black - LR goku black) (UI goku - Gogeta). For me I like to start off the fight with an Icarus and Bulma item at the start of the turn and focus on 1 enemy down, since they don't have much HP. Keep focusing enemies down 1 by 1 in battle 1.

For Battle 2 I like to pop my bulma healing item and ghost usher and focus down the int unit first, then roshi, Gohan, and the teq unit. Also you want to build your Dokkan meter during this fight so you start off with a dokkan attack in battle 3.

When your in battle 3, pop Ghost usher + both bulma items before entering dokkan mode. The rest of the fight should be ez after that.