 If you liked
Sousou no Frieren
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 ...then you might like
Tensei Daiseijo no Mezame: Shouki wo Joukashi Tsuzukeru koto Nijuunen, Okitara Densetsu no Daiseijo ni Nattemashita
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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.