In a real way, Kelly Services practically pioneered jobs from home, since it began primarily as a temporary job service. It now works regularly with some of the very largest employers in the country, providing staffing needs at all levels. They specialize in accounting and finance, administrative, automotive, engineering, information technology, life sciences, and call centers, but actually cover a multitude of industries and job classifications.
Send relevant writing samples. If someone asks for a marketing writing sample, send them marketing writing samples. Don’t send a finance article. Or a fitness one. It’s hard for a hiring manager to know how well you understand the niche’s industry if they can’t see a relevant writing sample. Apply to opportunities suited to your skill set and experience. Also, if your pitch doesn’t have a list of links to writing samples, it’s going to get ignored.