 If you liked Sousou no Frieren |  ...then you might like Tensei Daiseijo no Mezame: Shouki wo Joukashi Tsuzukeru koto Nijuunen, Okitara Densetsu no Daiseijo ni Nattemashita |
The Awakening of a Great Saint has a similar fantasy premise of Frieren: A post-demon king world. Frieren develops the philosophical aspect of a setting like that with a melancholic atmosphere, while The Awakening of a Great Saint tries to find ways of creating lighthearted adventures with this premise, some chapters borders on slice of life.