in case you’re still working to improve your SEO, and would like a kind of DIY tool to help you, I’d like to recommend you use Word Clouds SEO app from the Shopify App Store.
It’s free with limited daily use, and allows you to easily check your page keyword density with a generated word cloud based on the content of your page - you can also compare your page against a competitor.
Hope you find it useful.
App Store listing: https://apps.shopify.com/word-clouds-seo
Here I want to share some tips to help with Marketing and/or SEO setup: remove anything that slows down your site, Link to other websites with relevant content., writes for humans first, search engines second, encourage other trustworthy sites to link to you, have web analytics in place at the start, write unique and relevant meta descriptions for every page. I came across this informative blog https://www.incrementors.com/blog/marketing-of-my-shopify-store-via-seo/. It was a good read. This blog is tells about SEO steup and how to do marketing of my shopify store via SEO. This going to be very helpful to your store. While Shopify is loaded with SEO-friendly features, it takes a lot more to bring them out to your personal benefit.