When I was freelance, I made a small name for myself by creating the very first WebVR framework, before WebVR was even a thing, and then I told someone I could do HoloLens, having never even touched Unity before, but having tons of C# experience. I started doing more opaque VR Unity work after that at a startup. When that startup inevitably tanked, I got a job at a large consulting firm based on my reputation in the local VR community and a referral from a coworker. I was the only one who had any HoloLens experience going in to a project at the new job, and it just continued from there, reinforcing itself.
Always good to position yourself in a growing niche. It could amplify your career trajectory if it takes off and you have solid early experience and portfolio of work over the rest.
How did you get in HoloLens development?