Best advice I ever saw in a forum by a hugely successful shop: sell what people buy :) If you absolutely love pinwheels and want to focus on them as your product, this could mean thinking about them in a different light and selling them as such. For example, pinwheels as a baby shower or birthday party theme, pinwheels as wedding favors, tiny pinwheels as pen toppers to brighten someone's day. Take a thought and expand on it - think about how you can photograph your pinwheel to highlight its use as a wedding favor, how you can describe it in your titles and tags, how you can offer custom color options, etc.
As for social, I am finding the backlinks to be a good thing, but just sticking repetitive shots of your products out there doesn't work. To make the best use of social, you need to think about your channel-specific audience and what they are interested in. For example, most people on Pinterest are looking for DIY ideas and tutorials while Instagram seems more aligned with stunning photography and Facebook is more about who you are and what you are doing at the moment. That means your content needs to grab attention in different ways in those places. For example, say you offer pinwheels for wedding favors in your shop. On Pinterest, you may want to create a tall pin showing a few ideas of how to decorate the wedding reception with them. On Instagram, a single bokeh happy shot of a smiling bride with her pinwheel. On Facebook, a studio shot of you making pinwheels (you could double use this on Instagram). On all three channels, link back to your product listing.
Hope this helps! :)