You were tasked with defeating the cruel demon lord, to save the world forever more, creating an era of peace and tranquility for all.

And you failed, L bozo loser get gud

https://m.webtoons.com/en/canvas/how-i-failed-to-save-the-world/list?title_no=960877

Read this if you haven't already, its relatively short and is basically what I'm going for. And yeah, its basically a complete plagiarism, sadly.