There are a number of publications on Medium covering coding and other techie subjects, but I think you may be the only one covering, specifically, cybersecurity. Good for you! Having a narrow focus should ensure long-term success, though sometimes it's hard to see success for a while.

You may be interested in another new publication on Medium, the Publication Creators Hub. "PubHub" is the unofficial resource for publication management on Medium. Here, publication owners and editors can get help with creating, managing, and editing quality publications, attracting writers, and engaging readers.

You may want to check us out at https://medium.com/publication-creators-hub.