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If you're an artist and want to support a writer I genuinely think the best thing you can do is make art out of their fics. You'll definitely draw attention to the writer's work that way, and maybe followers too since artists tend to have way more followers than writers do.
Plus not only will you spread their work, but you'll make them SO happy. Writers starve for what little feedback they can get, and that kind of thing encourages them immensely to continue writing.
And of course it goes the other way around as well. Are you a writer and really like an artist's AU or OC or ideas? Write something for it! There could be no better way to show your support, and the artist will feel encouraged to keep drawing.
I guess all I want to say is that as key content creators for fandoms artists and writers should support each other 
