Saikyou no Kensei, Bishoujo Maid ni Tensei shi Houki de Musou suru

The greatest sword saint of all time, Arnoick, has died. His sword skills were passed on to his apprentice, and it seemed his story had come to an end. But then, Arnoick is reincarnated as the beautiful maid Annette! Due to his thin arms and weak body, he was supposed to give up the path of the sword and live a peaceful life, but he takes up a broom and stands up to protect Rosalena, the daughter of a fallen noble family. An overwhelming fantasy about a man who turns into a beautiful girl and restarts his life!

(Source: Overlap, translated)