MC should've just become a guild clerk or an inn manager. Closest to living "peacefully" in a medieval europe setting. Seems like author doesn't really know what he's trying to do with the MC.
Guys, I have an idea. When a good but niche comics are about to be cancelled to make way for more Isekai novels trash adaption, tell the author to write his script into a novel and then we just flood his page so he can continues making comics instead!
Being an adventurer is like a freelancer, he could just pick his quest and not forced to do them. Now being a hero/ sage in the end of the day goes to defeat demon lord but as an adventurer is your average blue collar worker. Or just what i thought of it.