Odds of Hanging On
Once they've established a good practice, the holistic medicine practitioners who stick around are the ones who know how to make their clients stick. The same is true for almost all independent professions, but perhaps especially true for this one.
People who make those garish and ugly Christmas sweaters, for instance, at least have a product that people can see, feel, and (ick) wear outdoors. Clients know exactly what they're getting when they order them online.
Conversely, an alternative medicine practitioner generally lacks quantifiable results, and as such faces an uphill battle to keep people convinced of their efficacy. It's all about word of mouth. You'll need to make sure that your work speaks for itself and that people then speak about said speaking.