Luminus is an open source project and there are many ways to get involved.
The Luminus mailing list is a great place to ask questions and share your knowledge.
The template is hosted on GitHub. If you have feature requests or would like to submit improvements, don't hesitate to open an issue or submit a pull request.
Luminus is built around the idea of profiles. If there's a new feature you'd like to see then simply create a new profile for the template.
The source for this site along with the associated documentation is hosted on GitHub.
If you wish to update an existing documentation page, simply edit the Markdown file for the page here.
Finally, you can support the maintainer on Patreon. Your contribution will help cover development and maintenance costs for the project.