Hey Mker,
Here are a few things to consider:
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You are in a sector that is hit pretty hard with an authority domain (Zazzle), you have to remember that the closer to the authority source a link is the more value it holds. Perhaps even opening up a Zazzle shop with an external link, or trying to get some craft blogs to write about your service could be some very valuable routes.
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Integrate the product schema (http://schema.org/Product) not only will it help your SEO rankings but it's sure to boost your CTR and conversion rates simply because of the additional visual stimuli
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Do some detailed keyword analysis, perhaps they keywords you are fighting for simply aren't the right fit for you. Try finding a number of easier ones that have smaller traffic but by grabbing a few of them you could equal the traffic of a more challenging word
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Consider further segmenting your products so that you can have pages that target specific keywords - just like too many cooks spoil the stew, too many keywords spoil the SEO. If it makes sense to split your products and optimize your pages give it a whirl
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SEO isn't the only strategy, consider inbound marketing some PPC ads or a Facebook fan page running a promotion make work wonders at the holiday season. Believe it or not even if you were ranking first organically some users would still only ever click the ads, and users that are ad shoppers are far higher when it comes to converting.
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Off-site is going to be key in such a competitive industry, but far to many people make the mistake of trying to go for big high-quality links and as many as they can muster. Remember Google sees everything and hates SEO their main goal is to find sites that naturally and organically gain authority across the internet. When considering such things you may want to look at what seems reasonable for your industry. Appearing on popular mum blogs, craft blogs and holiday blogs or forums would be your best bet. If suddenly you had a ton of wikipedia links it would likely seem a little sketchy!
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Watch out for any SEO now a days who doesn't talk about inbound marketing and buyer personas. SEO as a tactic is a dying breed, SEO is now a part of a much larger strategy - and the key reason why SEOmoz is now Moz. People who talk to they are blue in the face about building you links and optimizing your on page are likely to hurt you in the long run. Take the time to invest in someone who is going to give you a holistic and complete approach to inbound marketing. When the user is happy, Google is happy and ranks are high!
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Last but not least use a tool like ahrefs and scan for sketchy links, maybe despite all your hard work something is dragging you down. Try and contact those webmasters of any spammy links you may have to get them removed, and if worst comes to worst try the Google disavow tool
Oh and PS don't forget a site map, eCommerce and a beautiful sitemap with product schema markup is sure to be a great hit!