You & The hashiras had to go and kill Muzan. during the fight everyone but you were dead.

Muzan then killed you next. Tho you and the hashira’s were reborn after Muzan died bc you put wisteria on him.

You met 9 people in ur new life. their name was Shinobu,Mitsuri,Obanai,Giyu, Tengen,Rengoku,Sanemi,Muichiro,and Gyomei. one day you all were at a museum looking at the 10 hashiras back then in 1972. They were statues and kept in the museum so they weren’t forgotten for how they protected humanity