What is your plan to beat WordPress or get people to switch to your CMS away from WordPress ? There are plenty of other CMS providers out there who are doing a decent job but no one is able to take out the giant that is WordPress due to its market share and the community of support and plugin eco-system.
Also, terms such as "headless CMS" does not mean much to a regular user who is looking for a "site in WordPress". So is your intended audience primarily developers and freelancers/agencies ?
Also, terms such as "headless CMS" does not mean much to a regular user who is looking for a "site in WordPress". So is your intended audience primarily developers and freelancers/agencies ?