Yep. So, you can tell that the story originally has to be isekai. However, the Main Character must get beck to their original world (with friends, lovers, etc. would be prefered).
https://www.royalroad.com/fiction/38312/returning-to-no-applause-only-more-of-the-same - psychological character development of a broken MC. The MC is a level 999+ returnee. Unlike other stories of this genre, he's trying to suppress his violent tendencies that have been ingrained from over a century of being a murderhobo in the other world due to being hounded and hunted by armies like he was a demon lord. Upon return, he accepts surrendering to the police and being sent to a maximum security facility for dangerous outworlders where he's trying to decompress while he waits for the government to maybe approve him meeting his family again.
>Death March kara Hajimaru Isekai Kyusoukyoku >The Hero Who Returned Remains the Strongest in the Modern World >Kikanshita Yuusha no Gojitsudan >Zero no Tsukaima >Gate >Sword Art Online
Oooh! Didn't know you had an account here! I've read Death March, Sword Art Online, and Zero no Tsukaima. Will check out the others.