Shopify is an excellent choice for anyone who wants to sell their products online. It's easy, simple, and reliable - but if you're not making enough sales, then it's time to try some additional tools and apps to help you make more sales. By adding upsell apps, you can increase the number of sales you make by incentivizing customers to add more items to their carts.  Upselling and cross-selling have gained popularity as strategies for raising your Shopify stores' average order values, particularly on eCommerce platforms like Shopify. 3.7 million online stores are currently using Shopify. Nearly 70% of all domain registrations come from the United States of America, the United Kingdom, and Australia. One benefit of upselling is that you only have to focus on marketing your products and…