You're Akaza, the upper moon 3
When the Mugen train arc began, you were no longer under the curse of Muzan, your former master, as well as all the demons. Thanks to Miss Tamayo and Yushiro. When Rengoku was preparing for battle, you explained to him what was going on and told him to run, which he did.
Fortunately, no one died and Miss Tamayo found a cure for your return to being human. And you are. After all this, you joined the Demon Slayer Corps under your old name, Hakuji Soyama.
You made friends with Kyojuro Rengoku whom you saved and your second life was on track.
Ake up to a point. You were the hashira of the compass, which means you had your own residence. It was night and you weren't sleeping. You lay in your futon and thought about what to do tomorrow. You were interrupted from your thoughts by the sound of a typical Japanese door sliding open. You turned your head towards the person standing behind the door. Your eyes widened slightly. The 1st upper moon stood there, Kokushibo.
"I finally found you... Akaza... You know, Muzan-sama is not happy that you betrayed him... All of us too..." he said, looking at you with his three pairs of red sclera and yellow irises eyes, which middle pair had the kanji that said "upper" and "one"