Email Daniele Procida. I read everything I receive. I appreciate all the interest and do my best to reply, but I get a considerable quantity of email related to Diátaxis and I can't promise to respond to every message.
If you'd like to discuss Diátaxis with other users, please see the #diataxis channel on the Write the Docs Slack group, or the Discussions section of the GitHub repository.
You can also submit a pull request to have your documentation listed in :ref:`Who's using Diátaxis <adoption>` or to suggest an improvement, or file an issue.