Level up mit Den Göttern (2021)

Blurb:
“Maybe Inner Gods can never defeat Outer Gods …” so thought Yuwon Kim, a plucky, high-ranking warrior, after a bitter defeat. But Yuwon is too tenacious to give up. His loss becomes the dawn of a new journey as a returnee. With renewed determination, Yuwon starts back from where he began, smashing monster after monster and relearning his skills before taking on the Tower once again. But can he fight his way through the tutorials and level up once more, or will his conquest crumble before him?

Source: www.anisearch.com/manga/67804