Then study your competition and try their products. If one or more of your competitors are very successful, learn from them. Don't test only the product, study also their service offer and service behaviour. Believe me, it will never work. Find out what you can do better, how you can improve the benefits for the typical customer.
Many businesses concentrate mainly on their products.
Offer and provide always a fast, friendly, and reliable customer service. Communicate with your customers. If you really like what you sell, you have a good chance that your words will convince prospective buyers. If you are not convinced of what you try to sell, you might fail. If you want sell the product of someone other, test it before.