Help with ground slam build

Hi guys, can someone please help with the build?
This is my first character and I don't have much knowledge about the game.
I've been trying to make the build better and better and now it feels like I hit a wall.
The only thing I can think of is to get awakened brutality and melee physical damage, and maybe headhunter at some point in my lifetime, but that's about it.
can this build be further improved?
Maybe something I can change?
Something I can buy?

My character in PoB: https://pastebin.com/rzQw0ty2