Is there any way to increase power dramatically?
I'm on lv 89 with a team of:
Wind 5*
Sage Naruto 4*
Gakido 3*
Kazekage Gaara 4*

My power is currently at 55338

I checked the Power Up section and everything is at 100/100 except for Battle Armor and Upgrade Ninja Star Level.
I was wondering if what increases the power the most. Help?