This is similar to offer or limit order on CEX's

Create an order with the desired parameters, such as the amount of NFTs you want to buy and the price for each. Deploy a smart contract. Then any user will be able to sell the NFT as quickly as possible thanks to your existing order. This is similar to offer but from any user and any NFT from the collection.

Check out existing orders to find the best one. Open order, select NFTs you want to sell to order and confirm transaction.