Ecommerce stores can increase AOV by cross-selling and up-selling additional items.
Amazon is the best example- they have up to 9 sections that promote different or complementary products on product pages.
Even though you are not Amazon and don’t have so many SKUs, repeated customers, and tons of data about previous purchases, you can leverage that too.
You can try recommending some related products when a customer adds an item into their cart.
Research shows that customer responses evolve over time. In addition, cross-selling solicitations move customers to a state when the customer prefers the cross-sold product or building up a long-term relationship [7].