Help me [How to improve sales on Adobe Stock?]

You can compare your assets to the competition. If there are already thousands of the same asset types in the database, Buyers may never find yours. Review your titles and keywords. They must be thorough the descriptive. Compare the quality of your assets to other similar ones in the database. If your assets are seasonal, they won't sell until closer to that season or event.

What are you expecting? 

Sales are dependent on:

-- what is being searched for.

-- The assets you have to offer.

--  Whether your assets can be found.

-- The quality of your assets.

You probably want to ask over there in the Stock contributors' forum https://community.adobe.com/t5/stock-contributors/ct-p/ct-Stock-Contributors?page=1&sort=latest_replies&lang=all&tabid=all