You won't be able to delete the listing if you have any reservations still open. I also suggest Hosts don't delete a listing until they have filed the following years' tax returns. Otherwise you won't have access to financial information. You also might need the financial information as part of the records for the sale of the home. I usually suggest Hosts pause the listing (unlist) instead, then after 1year they can permanently delete it.
Go to the Listings tab and click the listing that you want to remove.
Look for the settings icon (top right).
When you click it, the first option is Listing Status. You can set this to Unlisted, but in your case it sounds like you rather want to permanently remove the listing.