I asked a monk and he said to talk to the abbot.
Have you already finished the cloister quest?
Spoilers:
Summary
There is no abbot in the game. Yes the monks in the cloister talk about one but he is sick or on travel or dead, he is nowhere in the cloister.
And even there was one, you’re in the current state of the game, you are not able to enter the cloister legally.
So I don’t think it’s possible for now.
WHAt is that
Excuse me?
What is that quest