Modifying Your Product, Creating New Products
You have done all you can to market your current product. Hopefully it is selling well! But, one product is not a company (usually). Think about new products or services you can create. Ideally, they should be related to your current line.
Sometimes you will see improvements you can make to your existing product. Make them, if you decide to continue producing your current product. If your products are constantly getting better, you will have a better and more profitable company.
With all your contemplated products, your overriding concern must be the financial and market viability of your product.