Apocalypse Nigh

How do I restart it? Trying to get a new earring.

Repeating the Quest

It is possible for this quest to be repeated. The earring previously acquired from this quest must not be in your possession to proceed (you must throw your first earring out in order to get a different one).

Target the ??? in the Empyreal Paradox and erase all memories of the quests "Shadows of the Departed" and "Apocalypse Nigh". Complete these quests again to obtain one of the earrings listed above.
For clarification, the earring must be dropped before you can receive the option to erase memories of the quests. Therefore, unlike artifact gear, it is not possible to retain your current earring while redoing the quests.