You will find it no longer worth that extra +1 Skill EXP for the money you pay
Now, at Level 65, Fortress Ruina, a new map, is really difficult for newcomers that wish Cabal Alz to use Aramid/Shadow-steel armor to kill mobs with, and should already found some small difficulties killing Stone Golems and Dark Bladers back in Port Lux. Now, you have 4 options:
1) Cease you’re questing that is related to Fort Ruina, and simply skill and train your level on mobs in Port Lux.
2) Upgrade your Adept equipments using Upgrade Cores (Low), and continue questing and leveling. But this costs abit of Upgrade Cores Low.
3) Continue you’re questing and leveling, but with no longer your adept equipments, but your best equipments you have gathered whilst leveling.
4) You have enough money to splash; spend it on Blustin or Titanium Adept armour items! It is more difficult to find, and also more expensive. Settle for Blustin, unless you have quite a spending budget for a full set of Titanium Adept with +3 Skill EXP.
Should you want +4 Skill EXP, you will find it no longer worth that extra +1 Skill EXP for the money you pay. Titanium +4 Skill EXP can cost up to at least 3 or 4 times the price of a Titanium +3 Skill EXP per piece!
Once you reach Level 70, you may start to equip Adept Bracelets, which would help you towards the +42 Skill EXP limit, so you may just buy some Adept items which only give +3 Skill EXP and save some money!