change the product as the market is already completely saturated, and isn't it the idea of the mini company to develop new products?
what is new about your idea?
put a nice bright color inside. it has to be water-resistant and firm enough to be part of your keys.
engraving can be an option to offer customized usb sticks.
you have many competitors. make sure that the stick has a good design to distinguish it from others. moreover, you could offer personalized sticks. for example, with a name on it. or, for example, with "my photos," "my music," "university," etc.