Versatility over specialisation: not the simplest thing to showcase & promote. People, and clients, want to talk to specialists. This is often right.
Yet Illustration should be more like design in its approach: in essence, it is about trying to find solutions to given problems.
My work takes a wide range of directions, since each style is crafted for the specific requirements of a project or brand. If you still want specialisation, keep in mind that Illustration is a just a part of visual communication. It doesn’t have to be a single style, or technique. It should be what works best for the job.