I have only sold ebooks on Amazon. I have not sold any physical products. I can say you how can you sell more ebooks on Amazon. You can use these tips to drive sales to other products. First of all you need to have a good title and description, you should use your trageted keywords on your title and description. Secondly, you need to get reviews for your products. Since it is really hard to get reviews when you have just listed products, therefore, you should reach your friends and family to write reviews for your products. Thirdly you need to market your products on other channels.