I would greatly advise making use of tags in your listings; they help buyers find you in search results. Try using words that a buyer is likely to type in when looking for what you do specificially, so words that associate with your style, mediums, subject matter, etc. And there is also the daily homepage themes, where they have a new list of specific tags every month, which is here;
So if there’s a tag on that list that applies to your art, you can use it to get onto the homepage on that day!
Hope that helps somewhat, otherwise you have a really lovely shop!