Elizabeth, this is conjecture, but I think the breadth of your profile may be hurting you.
I am also a writer with a wide variety of writing experience and experience in other fields. When I started on Upwork, I did okay. But, since I narrowed my focus and started offering only one specific type of services (law firm website content and ghostwriting for attorneys) through Upwork over a year ago, I've had more work than I can handle--and, at a higher rate.
In the real world, being an interesting person with broad experience is often helpful, but when someone comes to Upwork to hire a freelancer--especially a freelancer at the higher end of the price scale--it's usually because they're looking for a very specific expertise. It seems (from my experience and that of some other successful freelancers here) that a higher-end Upwork client doesn't want to think about you splitting your focus between his/her type of work and volunteer work, art, etc. That extra information seems to trigger a "jack of all trades" perception in many clients.
If you have the writing chops and that's the service you're offering here, consider narrowing both your profile and the type of writing services you're offering and bidding only on jobs that are a very good fit based on some specific aspect of your past experience. There are nearly half a million writers on Upwork, but if you can take yourself out of competition with the masses and target a particular type of client to whom you have something special to offer, there is a lot of good work to be found.
