Ask HN: Ways to get insights from your ideal customers?

I'm developing a solution for marketing analytics challenges and want to better understand customer pain points to refine my messaging.

I'm considering inviting VP/Director of Marketing or CMOs for a casual hour-long meeting with a complimentary lunch. My worry is that would they wouldn't entertain the idea at all.

Is this an effective approach? Are there alternative ways to connect with these individuals?

Cold calling hasn't worked for me, as all calls have gone to voicemail.

Any suggestions are appreciated!