Analyze your product pricing compared to your competitors. If your prices are significantly higher, it might be affecting your sales. Then take necessary steps to improve your sales. You can offer temporary discounts or promotions can help stimulate sales and attract more customers. With these things you can work towards reducing your excess inventory, improving sales performance, and maintaining a healthier inventory level on Amazon. But if you want to lower the inventory without spending too much time then you can create a removal order for those products that are not getting sales.