Can anyone please tell me a verified marketplace or community where I can find writers filtered by their experience, work for technical and health related topics?
While it is not specifically for writing about health-related topics, Envato Studio has a marketplace with writers who are available to write content on any subject.
You can contact the writers you like and ask if they can carry out the task you need help with.
You can also find copy editing, blog writers, press released, technical writers, cover letter help, and creative writing.
Disclaimer: I have a shop set up there, but I am not self-promoting. I have no experience writing for health topics.