After Amazon store is downgraded, you need to take corresponding actions according to the downgrade reason and Amazon's suggestions in order to restore the store level.

The following are some common reasons for store downgrade and corresponding countermeasures:

Return rate is too high: Ways to reduce the return rate include providing detailed product descriptions and photos, using high-quality product pictures, answering buyers' questions in a timely manner, providing as much information and support as possible, etc. If your product has quality problems, you should solve these problems in a timely manner and replace or refund.

Negative review rate is too high: To improve the positive review rate, you need to provide buyers with high-quality products and services, and handle buyers' questions and complaints in a timely manner. Try to make buyers satisfied with your products and services, so that you can get more positive reviews.

Delivery speed is too slow: Strengthen inventory management to ensure timely delivery and provide tracking information. Establish a good cooperative relationship with the courier company to ensure the quality and speed of the courier service. Set up order management strategies in the Amazon seller backend to ensure that you can process and ship orders in a timely manner.

Violation of Amazon policies: Strictly abide by Amazon policies and regulations and avoid violating any regulations. If you are not sure whether certain actions comply with Amazon's policies, please check Amazon's Seller Center or consult Amazon's customer support.

If you have taken the above measures and believe that your store has met the upgrade standards, you can apply for store upgrade to Amazon by following the steps below:

Log in to Amazon Seller Center, select the "Help" menu and click "Contact Seller Support".

On the Contact Seller Support page, select "My Account" and "Store Upgrade", then select "Store Downgrade" and explain the actions you have taken and the improvements you have made.

Provide all necessary information and submit the application as required by Amazon.

Please note that store upgrade may take some time, and Amazon may need to review your store to ensure that it meets the upgrade standards. Therefore, please be patient and continue to provide quality products and services for your store.