Try concentrating on why your items aren't selling instead of looking for new ones.
Could be that it isn't the choice of product, which is more than likely the case given that you have tried a diverse range. More chance of it being something related to the listing, poor copy, price, bad pics, shipping issues, ect.
Go over every aspect of your technique, ignoring the product itself, and identify your areas of weakness, then see what measures you can take to improve on them.