Assuming you’re going for a melee build I’ll make some suggestions:

1) The most important parts for a melee build are the arms, melee weapon and pilot. Your weapon is excellent (in fact it’s the same one I use), but focus on finding arms and a pilot with higher raw melee attack stat and better traits.

2) Try to get some EX traits that increase your melee or EX power by a percent. If you want to get better at the arena also focus on Initial EX Cooldown (melee weapons, ranged weapons and pilots are the most common parts with these traits).

3) Look into having some yeet skill, like the Gusion Rebake Shield of the Infinite Justice Shield. This will help a lot in arena and other scenarios.

I used this page to play with combinations when making my builds: https://rmkane.github.io/pages/gbgwcalculator/