#resume

"Published (number of works on ao3) written works spanning (lowest word count) to (highest word count) to a nonprofit international digital archive dedicated to preserving and maintaining society's reactions, impressions, and culture regarding various forms of fictional media."

You can also simplify it to "Creative Writer - Archive (dates) and then put "Wrote for a nonprofit digital archive as a volunteer."

Plus, if you have a lot of hits or kudos on your works, you can say, "I reached (number of hits) people and (number of kudos) of those people signified to the Archive that my work resonated with them."

Because, technically, we are all volunteering our time and donating our writing to AO3's cause of preserving the fandoms and the culture around them. And people do sometimes just call it "Archive". So nothing I just said was a lie.