Struggling to Fill Challenging Positions

As a newcomer to HR recruitment within the healthcare sector, I have been assigned the task of filling several positions that have remained vacant for months. Two of these roles—Radiation Therapist and Audiologist—are proving particularly difficult to fill due to a lack of local programs.

I’m reaching out to seek advice on how to successfully recruit for these hard-to-fill positions. What strategies have you found effective? (Please note, I’m looking for alternatives beyond hiring an agency, as that option has already been ruled out.)

For additional context, I have already tried posting advertisements, utilizing multiple job boards, and reaching out to candidates through purchased resume banks via emails, phone calls, texts, and postcards. I also plan to attend upcoming university job fairs. Any further suggestions would be greatly appreciated!