Having an ecommerce website without seo means you are taking the risk of not being visible during your customer's buying journey. When you are not visible on search results, you sell less, and your growth slows down.
At the same time, your competitors will increase sales and profits & you are letting them grow stronger.
So having an ecommerce website with seo can put you one step ahead as per today's market sale, business growth, traffic and revenue.
Take a look on ecommerce web development work