Choosing ecommerce SEO services starts with your business goals, not a package....

https://wiki-wire.win/index.php/My_Store_Has_Traffic_but_Low_Organic_Conversions:_What_Should_SEO_Focus_On%3F

Choosing ecommerce SEO services starts with your business goals, not a package. Look for experience with issues like faceted navigation and stockouts, then ask how reporting ties work to results—and what any guarantees actually cover.