Ask HN: How do I write a good request-for-feedback email to my users?

I have a project with some users, and I'm trying to determine the root cause of churn. I've been sending the following email to my users to get feedback, but I'm not sure if it's any good. Does anyone here who is more experienced have suggestions on what I should do?

Hi,

I'm X--the guy behind Y. I'm trying to improve the product, and I'd love to chat with you about your experience using it. You're one of my earliest users, so your thoughts--positive and negative--could really help me understand what I should prioritize as I continue to improve Y. Do you have any time for a 15 minute chat in the next few days?

Best, [My Name]