@DavidR2D2
Probably not worth it. Shopify is pretty well optimised for SEO out of the box.
Main on-site things to get right are:
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check all your pages load quickly
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make sure your product descriptions are unique
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add Alt tags to all images
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use Collection descriptions and think about how to structure your collections from an SEO perspective
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use blog posts
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internal linking
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Various other small tweaks but the above should get you most of the way there.
Ahrefs has a decent and free site auditing tool that you can set to run regularly and will highlight things to fix. https://ahrefs.com/webmaster-tools
The rest is then down to off-site SEO, targeting the right keywords, backlinks, etc.