Challenges in Filling Difficult Roles

As a newcomer to HR recruitment within the healthcare sector, I’ve been tasked with finding candidates for several positions that have remained vacant for months. Among these, the roles of Radiation Therapist and Audiologist are especially challenging due to the absence of local training programs.

I’m seeking advice on effective strategies to fill these hard-to-fill positions. What options do you recommend exploring (besides hiring a recruitment agency, as that route has already been ruled out)?

Update: To provide additional context, I’ve already taken several steps, including posting job advertisements, utilizing multiple job boards, reaching out to candidates through purchased resume databases via emails, phone calls, texts, and postcards. I’m also planning to attend upcoming job fairs at universities to expand my search.