Thank you for the great tip.

1. Yes, I have those metrics.

Here's how I imagine I'd carry it out:

1. manually send an email with a link to a survey on google forms

2. if they fill out the survey, offer $ to chat on the phone

3. If they don't fill out the survey, pester up to 3 more times to take the survey. Use different email copy each time, gently remind them to take survey and reply in the same email chain.

In the 4th email, write "understand they're busy. If they get a chance, please take the survey. Thank you."

If you find problems with the above sequence, please let me know.