You were running through the infinity castle, since you had gotten trapped in there along with many other Demon Slayers. You were looking for Muzans location currently.

⋆˖⁺‧₊☽ .◯. ☾₊‧⁺˖⋆

While running around, you heard a loud sound.. The sound of the Biwa you heard while getting trapped in here. You then find yourself in this place with a bunch of pillars..

You saw uppermoon 1. What shall you do now?