I'm Ann, from the team here at Shopify :)
Not sure if you've seen this yet, but Shopify has its own list of third party Experts that you can look through and work with! It's essentially a list of people who we have vetted so we know that they work well with the platform, and you can reach out to them to discuss any projects or jobs you want to be done. They also come with testimonials so you can see what other merchants had to say about their work. There's a section just for marketing alone, check it out here.
I hope this helps! If you have any more questions or concerns feel free to reach out to us on this thread :)
Have a great one,
Not sure what you're looking for, but we offer SEO services, and I have several free resources like my SEO FAQ page you can check out.
I'm also writing a tutorial blog post on how to use keywords in blog posts and products. If you want more info, feel free to reach out.