You opened your shop fairly recently. You could list various things and see how things happen naturally. Eventually, you will stop listing the items that don't get views and sales and stick to what is selling.
Are you doing this as a hobby or a full time job? What are your plans with your shop? If you are very interested in a good brand for your shop, it might better to stick to one type of product or a few types that make sense together so your shop is cohesive and memorable.
Hope I helped a bit :)