There are tons of gender-bender/ gender-swap mangas with m->f changes, but most of them that aren't Isekai tend to involve some other mechanism than dying for the change, like a potion or virus, or just skipping an explanation and they wake up one day and they're female. There are tons of tons of them, if the 'dying' party is not a hard req.

A few I saw that looked interesting:

• Eiyuu no Musume to Shite Umarekawatta Eiyuu wa Futatabi Eiyuu wo Mezasu

This one is about a male hero who dies, and is reborn as the daughter of 2 of his former party members.

• Boku Girl

The trickster god Loki turns a boy into a girl.

• Bishoujo ni Natte Chiyahoya Sarete Jinsei Easy Mode de Ikitai!

Boy begs Santa to reincarnate him as a girl, and gets his wish.

• Pumpkin Time

Boy transitions into a girl as she grows up, and reunites with a childhood friend (guy) who she had a crush on as a boy.