General

What to upgrade next?

I was wondering what to upgrade next with about 15b or should I continue saving and buy upgrades later? I was thinking the only thing I need at this point would be a perfectly scrolled superior gollux set with crappy pot but they are expensive now. I was also thinking about tyrants(belt+shoes) but they are even more expensive. Just need to know the most efficient approach in funding my bowmaster at this point any input is appreciated. These are my equips:

cape: 3L unique 12%dex tyrant cape 5 star

bow: 311 att 3L unique 30% boss 12% dex fafnir wind chaser

hat: RA hat 15att 15% dex 3L unique and 2% all stats neb

shoes: 17att nova shoes 3L legendary 18% dex and 2% dex neb

earring: alien fragment earrings 3L unique 10% dex

gloves: alternate between 27att high quality dimension gloves and top 50 dojo gloves

level 40 top: clean 3L epic RA top crappy pot

level 40 bottom: 9att 2L rare RA bottom crappy pot

eye: spectrum goggles 14att 3L unique 14% dex 2% neb

face accessory: 11att 3L rare crappy pot branch nose

book: 30% ignore def +1 all skills (+8 all stats)

belt: 9% dex 2L epic tempest belt

rings:
critical ring: 2 att, 10% crit rate,10% crit dmg
reinforced gollux ring: 29att, +13att bonus pot, 15% dex
tempest ring, 9% dex 7att
alien fragment ring

shoulder: 3 att, 9% dex tempest shoulder
Black swordsmen medal

pocket: +20dex, 10att model student pocket item

emblem: 6% att 3L epic adventurer emblem

heart: 30att beryl heart,crappy pot 3L epic

2ndary weapon: blasted feather 5att, +10dex/str, 6%all stats 6% att

pendant: alien fragment pendant 7% dex 3L unique
all my equips are at least 10 stars except for RA top
I also have these link skills:
phantom, kaiser, angelic buster, canoneer, zero, lumi, DA, demon slayer, merc, xenon, kanna, and cygnus blessing currently
all of these links are level 2