which items should I upgrade, to get the biggest boost.

here we go:
34dex 30luk 12atk 18% luk 30% potion enhance ravenhorn hat.
legendary

3dex 24luk 12atk 1% luk(lv10) luk nose.
epic

2str 2luk 8% luk broken glasses.
epic

33dex 34luk 18atk 15% luk chaser overall.
unique

7dex 10luk 10atk 21% luk chaser cape-
legendary

20 all 10atk 12% damage 12% allstat 15% boss damage dojo glove..
special.

15dex 21luk 9atk 18% luk 30% potion enhance ravenhorn shoe.
legendary

10atk 18% allstat immortal phararoh belt.
legendary

30/22/28/30 8 atk 27% luk CHTP.
legendary

21/20/18/18 4atk 17% luk rising sun pendant.
unique

white angelic bless

14dex 14atk jewel ring

8dex 8luk 4atk 3% luk 3% dex tempest ring.
rare

2 dex 6 luk 11% luk alchemist ring(lv10).
legendary

10atk expiring android heart(I have a 21all 35atk lidium, unworn).
rare

13dex 13luk 8atk 8% luk ravenhorn shoulder.
epic

10atk 12% luk metal heart earrings.
unique

53dex 74luk 213atk 70% boss 30% PDR ignore ravenhorn cane.
legendary

65% boss 9% atk +10kdmg dernie card.
legendary

colors of the items name indicates the potential. <scratch that, colors don't work.

I'm currently sitting on(roughly) 70-75% PDR ignore.