 If you liked
Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka
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 ...then you might like
Saihate no Paladin
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1) Both stories are set in a fantasy world
2) In both world gods have a proactive intervention
3) Both main character have a really admirable determination
4) Both main character make a vow to an almost unknown goddess
5) Both main character were call "hero"
Both are fantasy mangas with great world building. Although the writing is different in both tone & style, they're very oddly similar imo. Saihate no Paladin is more mature and has a western D&D style fantasy. While the latter has stuff like harems and the traditional jrpg element.
*I probably should've paired this with the Light novel version of Saihate but I've only read the manga.