How to Survive as a Trash Extra Villain Novel

I possessed a worthless extra who bullied the protagonist and got expelled after being "taught a lesson."It’s a small relief that I know the original plot,but the real problem is that this novel’s world is headed for destruction.There’s only one way to survive in this damned world:somehow help the protagonist and prevent the apocalypse.But all I get are looks full of contempt from everyone around me.“Hah, it’s too late to change the setting now…”Fine, so what if I’m alone?A villain survives using a villain’s methods.Protagonist or not—I’ll survive this my own way.