welcome back!
well, as you already have 30 skill, you can choose either CS-VP-OB, or OB-ED (But ED need 38 skill point to have max benefit from shield ring)
these are key RG equipment and the requirement
+7 Imperial Boots: + Max HP/SP, + Ranged Attack, atk 20% (sacrifice must be lv5), 100% def bypass (pinpoint atk must be lv5), shield spell cooldown reduce(pretty end-game)
+10 Circlet of Phoenix: basically +Damage, Reduce Cooldown for OB (must have for OB), also give great defensive bonus when Vanguard Force is lv 5 (+max hpsp and 150def), at +10, gives 100% def bypass for free
Imperial Feather-RoyalGuard Necklace: full benefit if 120 Base AGI: 180atk, flat ASPD, immunity to blind and silence, and many more benefit revoling around VP-CS
Imperial Spear-Guard-Ring-Glove: a set bonus with full benefit from VP-CS, pretty much must have for VP-CS build
Shield Ring: a must have for ED-OB build, must have lv 5 ED to use OB, must have lv 5 Inspiration to max benefit ED
((but maximizing ED need True Randel Card, which is pretty expensive, ~2b, and need 2-3 of em))
this set will leave you ONLY armor and garment slot to change with. for armor i recommend Evil Dragon Armor, for garment i recommend Skin of Ladon
the stat is definitely SAVD
my 170 RG has:
120str
120agi
90+vit
80+dex