Thanks for the mention, James Finn. I have to credit Tom Kuegler for teaching me about writing for the topics (tags) that you want to be known for on Medium. As a content social platform, the Medium algorithm rewards you for being a consistent, frequent writer, and writing for a niche (a tag of a similar group of tags).
You are ALSO commenting and interacting, which increases your reach.
Congrats on the top writer status!!