I'm a 22 year old German native speaker with a passion for writing. The topics you listed, like fashion, beauty, health, and travel are things I am strongly interested in, which is why I believe I would be fit for the task.
As for the relevant experience, I have been working as a freelance content writer for various homepages, however, these were usually descriptions of companies or their work. However, your project seems like a fun change, and I would enjoy working with you!