Upgrades and downgrades are listing-specific. If you have multiple Sponsor Listings, you can downgrade one Sponsor Listing to a Free Listing, and keep another as a Sponsor Listing.
When a Sponsor Listing is downgraded to a Free Listing, the listing remains as a Sponsor Listing until the end of the paid period.
You can downgrade your Sponsor Listing to a Free Listing in the Heritage Web dashboard:
Select “Listings” in the header menu
Click the edit icon for the specific listing
Select “Downgrade Listing”
Confirm the downgrade