Getting Ghosted? How to Make the Sale

Halloween happens only once a year, but ghosting happens all year long. 
 
Picture this: You've met with the potential client and felt like things went really well. You hit all your sales points, they seemed really interested in the product, and you could clearly see how the client would use your product. 
 
Then... nothing. No calls, no emails, and no purchasing. You've been ghosted. What can you do to ACTUALLY make that sale?