Here are some low-cost or free ways to attract top-quality mentors for your new marketplace:

Leverage your existing network. Ask current mentors if they have any referrals or recommendations for other qualified mentors they know. Word-of-mouth is powerful.

Post on relevant industry forums and groups on sites like LinkedIn, Reddit, and Quora. Introduce your platform and what you're looking for. Engage in discussions to build credibility.

Contact local universities and colleges. Many have career centers, alumni associations, or professors who may be interested in mentoring students.

Reach out to professional associations and organizations. Groups in your focus areas, like entrepreneurship councils or astrology societies, can spread the word.

Pitch relevant industry influencers or bloggers: Ask if they'll write a post highlighting your platform and mentor opportunities.

Host virtual information sessions - Share details on your platform and directly recruit mentors through Q&A livestreams.

Offer perks beyond money. Highlight non-financial benefits like networking, resume building, and helping others.

Use a waitlist. Get early signups and follow up when you're ready to onboard more mentors in each category.