Put a clear link for feedback on the emails sent out to purchasers. It is not obvious how to do this.
I bought a few items for presents and pleased with all of them. I've been looking for some time but can't find out how to do it.
Maybe I'm the only person this dim but hopfiully not!
There is a link to leave feedback (registered buyers only) in the notification email that is sent when the seller marks an order as posted.
Deborah O'Hare commented
I have buyers tell me that they find it hard to find feedback so don't bother.