This is what I'd write if I were to apply for an editing job:
Hi! I'm very interested in proofreading your novel.
I'm an experienced content writer and editor who has written over 150 articles. I proofread and edit every article I write myself, so I have a lot of experience with improving grammar, punctuation, spelling, etc.
In addition to writing articles, I read a lot of books. (This year alone I read over 50.) I understand how important it is for romance authors to craft the best possible worlds for their audience. I also understand that both grammar and creativity play an important role in writing.
It would be a pleasure for me to help you enhance your writing both grammatically and creatively.
If you have any questions about my work, do not hesitate to ask. Good luck with your novel!
And this is what I'd write in my description:
I'm an experienced writer and editor. Both creativity and technicality are important to me, so I make sure to transform articles, resumes, and manuscripts into works of art that are not only easy to read, but pleasant to experience.
I've written over 150 articles about art, personal development, photography, travel, and more. I've also worked on short creative stories inspired by fictional universes. These projects have strengthened both my editing instincts and my love for enhancing written work.
I read over 50 books every year. My love for books allows me to feel comfortable with very long manuscripts. It also helps me understand what outstanding writings consist of.
My goal as an editor is to enrich your work and provide you with the best possible version of your story, whether it's a short profile description or a lengthy novel.