If you need to relevel your character, you can do that inside the Tower of Power.
Tower of Power is located in Mulrok Village (Get to Mulrok Island first, either by boat or by a portal, if you are an Underdark Faction) Inside Tower of Power, an NPC will store the amount of experience desired for you:
Stored Experience will persist even after reboots, it is all stored in our SQL DB.
When you will ask to have the experience back, you will receive the HALF of what you have deposited.
The stored EXP is available ONLY to the character that has stored it, it WON'T work cross character of the same account!