Seeking insight from job-seekers in Japan: How to effectively reach you?

I specialize in recruiting for Chinese companies expanding internationally. A recurring challenge is connecting with Japanese talent.

Frankly, the engagement on LinkedIn is very low—fewer visible profiles and minimal responses to outreach. This leads me to my main question:

Is LinkedIn just not the primary tool for job hunting in Japan? Or are professionals here less likely to be openly "looking" or responsive to external recruiters compared to other markets?

I'd really appreciate your perspective on:

• Where do you, or people you know, primarily look for jobs?
• What's the most effective way for a foreign recruiter to make a professional connection?
• Any cultural nuances in the approach that I should be aware of?

Understanding this better would help me bridge the gap. Thank you for your help!