I used to have a shop on Etsy around last year, but I closed it, so my info on the site might be a little outdated, however... here's what I can tell you so far:
-Shipping costs. Etsy made it so that if your products have shipping fees (especialy to the US), your product won't show up in search and/or will be pushed waaaaaaaaaaay back in search results. To avoid this, you should make sure to include your shipping fees with the price of your product.
-Keywords: make sure to use as many of them as possible and avoid keywords with more than one word, e.g. "resin keychain". Use "resin" and "keychain" instead. In this way, you will be found by people searching for either "resin" stuff, people searching for "keychain" and people searching for "resin keychain". With "resin keychain", you will only be found by people looking for that very specific thing. Tip: search for products that are similar to the ones you're selling, check their keywords and use them! 
-Sad truth, buuuut... overall, fanart seems to sell a lot more than original stuff, on Etsy and everywhere else -_- so if you don't have a popular brand name slapped onto your product, selling it will be more difficult. Which is a huge problem, since you're not really supposed to sell fanart and doing so might cause you legal issues with the rightful owners. Once again, research is key: look for popular products, see what sells and look at their titles/descriptions/keywords. One thing I noticed in your shop so far is that you pretty much have the same title for every decoration, which makes them hard to find. E.g., you have a wooden decoration with a house painted on it and another one that looks like a Christmas three ball, yet both are called the same: try including the subject of your decoration in the title of your product to differentiate them from one another. Same goes for your Christmas cards: you have a card with two cute mice painted on it, mention them in the title!
-Spam, spam, SPAM :'D share links to your shop on Facebook, Instagram, anywhere you can. Post pictures of your WIP on social media to keep people interested in your work and keep them updated on your progress. Be careful not to overdo it, however (e.g. by sharing the same link over and over again for days in a row), 'cos that gets tiring fast and might drive people away instead of getting them interested. Find groups on FB and other social media where you can also promote your creations
-If you have money to spare, making a promotional post on FB/Instagram might also be a good idea. However, I'd leave that as a last resort: there's a lot you can do without paying a cent and I suggest starting from there rather than throwing your money at social media platforms as your first approach.
