Record your NFT being a Timed Auction if you wish to offer it to the very best bidder once the time you set has been arrived at (you may permit a reserve selling price). Also, it is possible to list it having a declining value (having a set ending price). https://nftonopensea39404.blogofchange.com/22211645/not-known-factual-statements-about-nft-on-opensea