Buyer Backing Out 5 Days After Earnest Clears - Any Loopholes?

[Art Maydan]

I listed a house and it sold in 10 hours for $15K above asking. The buyer is now backing out 5 days after $5K earnest money cleared. It's my understanding they have 7 days to back out for any reason and get earnest money back. Are there any workarounds here to keep earnest money or is there nothing I can do? This is my first listing, so thanks for answering my newbie question!