What team are you using him with? What is his Ignore Defense? What strikers do you use? Is the problem you can't do enough damage or you can't survive long enough?Increase your valor
There are a lot of other things you can improve:
- Realize potential and raise his level further.
- Increase his gears further after you do that.
- Keep working on your cards.
- Keep awakening his ISOs
- Buy his uniform and upgrade it.
- Give him better urus.
- Looks like he has a pretty high critical damage, so maybe increase his critical rate more
- Increase your valor, bonuses, and raid level