 If you liked
One Punch Man
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 ...then you might like
Heion Sedai no Idaten-tachi
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Both Series came from a web novel, both series also have insane OP characters and comedy.
Heroes Vs. Monsters?
Gods Vs. Demons?
Both are always fighting and having some peacetime.
Just adding on to previous noteworthy statements (Both are 'Seinen' and came from webcomics with manga remakes and adaptations by related studios: Madhouse-Mappa)
Both of these shows tend to make "anti-climatic" comedy by having their main characters be so powerful and make them not so heroic, more like apathetic to others, still, OPM is the more positive side of this equation while Idaten works as a more cynical take with some fantastic elements thrown in the mix. They're centered on action and their animation quality is very good (especially in OPM).