If you are a lvl 120+ character planning on reborning then here are a couple of things you might want to do before and after rebirth:
Before Rebirth:
1- Complete Demon Exterminator Quest ( Do not claim until after rebirth)
2- Get as many apprentices as you can (Lvl 120's can have 5 apprentices, 130's can have 7)
3- Wear a Fan and a Tower *Any Quality* ( Do not take off until you've reached lvl 100)
4- Do Flame Lit ( Get All 10 stones and claim after rebirth )
After Rebirth: (Do These In Order)
1- Do AC Captain Quests (Takes 5 mins if you have an archer lvl 70+)
2- Claim Jar and Flame Lit
3- Do Equipment Bonus Quests ( Reward = 1 exp ball + 1/6,1/3 or 1/2 of an exp ball)
4- Do PK Tournament, usually there's not competition as strong as you (Reward = 5 exp *****)