How do I get more? I see mages with 25-30 crit running around (endgame), while I only have 8-9% petless, 18-19% max with Nekro, 14-15% with those 6.5% crit pets ;-; (rounded)

Gear.
Immo/Hexstone staff
Rotting helm Bru
Rotting vest Bru
Elon sash Brilliance
Rendtail ring
Planar pendant
x15 standard mind, x1 fort mind

I want to get more critical without sacrificing too much damage (ex. downgrading from Immo to Dragon staff), what do I do? Lightning jewels give so little
Should I switch for assault gear? I have 137 dex petless and it has barely brought me to 6% crit (not counting sash's crit buff)...
Can't afford any eyes :x