tl;dr: Is there a way to abandon or reset the progress of a main quest?
(minor spoilers) I started the Chasing Shadows main quest where the Prophet tasked me with finding the agents of the Worm Cult in Vulkhel Guard. I needed to talk to two witnesses to find out more about them but went straight to the lighthouse, not aware that this is where the quest would eventually take me.
As soon as I entered the building, the quest was updated to the "Investigate the Suspicious Door" stage and now I cannot talk to the two witnesses I've been sent to for questioning.
Some googling led me to believe that it was previously possible to abandon a main quest but now the only two options I'm given upon right-clicking the quest in the journal is "Show on the Map" and "Get Help". Is there anything that could be done to restart the quest?