My advise would be that you treat the list as though you'd had no previous dealings with them. They are not past customers and they have shown no interest in buying a coffee subscription, so treat this scenario like you would any first time meeting with a total stranger; get to know them or get them to know you.
Provide some valuable content to them for free that is connected to your current product. If you're lucky, a few of them will resonate with your content and may even show interest in the product. Woo them!
If your product is a match for just 10% of your list, it's a great start. Focus on delivering superior value to them so you can get them to introduce you to their network.
It's all about relationship and delivering outstanding value from there. I wish you all the best in your new venture my friend.