Kiyou Binbou Ojisan no Isekai Saibouken

Swordsmanship, magic, physical strength... Marco Pietala is a jack-of-all-trades who retired from fighting because he was unable to master any one skill. He was living a carefree, slow life with his wife, Oni, a Hobbit, until one day, their house was attacked by a beast... A fantasy about a man with low self-esteem who starts his adventure all over again!

(Source: Manga Park, translated)