I’d say the only place you could really carve out any meaningful space is if the book centered on advice for pursuing non-academic careers. Advice books can be tough because the landscape can change in a few years rendering the book useless unless you plan on releasing new editions on the regular. Students have very easy access to academic physicians who can provide constantly updating information. At least if you focused on non-academic practice, you would be providing advice that students find harder to come by which would offset the fact that it won’t be constantly updating.