>>535015670
Not having a blaster means you're missing a lot of damage, and using both Suit Tama and Muua probably isn't the best idea (Suit Tama is doing little for you other than some crit damage). And yes, level your units up. And put Inori in the front row, she has an LB0 passive for +2 SP on battle start.

This was my team, which got 1.2m on a slightly imperfect run (didn't quite cap DR).