Tensei Daiseijo no Mezame ~Shouki wo Joukashi Tsuzukeru Koto Nijuunen, Okitara Densetsu no Daiseijo ni Nattemashita~

[MangaDex]

 

[Treinador-O-MAIORAL]

Interesting Fantasy/Isekai with a cleric MC who sacrifices herself to defeat the demon lord. It's on the edge of a slice of life but it has action and adventure as well. It's available on the Kodansha K-Manga App.