We must understand the psychology of people when it comes to selling products. People would not buy things they do not need. Therefore, as I said earlier, you have two choices:-
1) Create the need for your product:- You must create the need for the product and you can do this by making people realize the improtance of your product.
2) Invest in products that people need:- If you cannot create a desire in people to buy your products, then you can invest in products that are already desired by people.