Its recoverable.
Its not permanent, but you literally have to reinvent yourself and become a new person for you to get out of it. For instance, you would start as a nice guy and leave her for 3-6mos and return as a motercyle riding, bulked up, womanizer or return as a mysterious/traveling archetype of dude. Your changes must be so dramatic that she must reevaluate your relationship to her.
But even tho you can fix it, the friend zone is rarely worth the effort to to get out of it when you can just meet a new woman. There is no shortage of women in your city
