Any help or suggestion to boost my damage is most welcome

Hey everyone.
I am playing a trickster build and doing delve. Currently at 4.800 depth. So far from tankiness I am satisfied, though I am looking for crafting new jewels to get my resistances to 89%. My major problem is damage though. The deeper I go the most evident it is. I am aiming for 6k. So I dont think my damage will suffice and I am not so sure that the current tankiness will do either. I am out of any reasonable ideas, like if someone suggests to double corrupt my armour piece and hope for +1 gem lvl, +50% increased damage... I dont think it is on the reasonable realm. Anyway as the title says any ideas are most welcome.
My current POB
https://pobb.in/HpjOFVw0q8a4
edit: I only have ideas about tankiness. Like I mentioned before crafting 2 new cobalts jewels that in total will give +4% to max lightning and fire resistances. Buying two legacy potions with 100% evasion and armour increase.
Maybe replacing exarch implicit in chest piece with +1% to maximum resistances instead of 15% potion effect...hmm dunno.
But for damage... nothing serious. Like get concetrated effect 21/23% which will give like 9.000 DPS.
I am currently at the PATHETIC 5M DPS -.-
Some delve videos for reference of the build:
https://youtu.be/R_blktZ5zVk
https://youtu.be/wlMhzSy-oQs