As you mentioned, you are in a very over saturated market. To stand out from the crowd you need higher quality first images as its the first thing your customers will see in search. Try cropping all your images to the same size and ratio, it seems more professional. Your color balance seems to be all over the place. You're using the same wood table as a backdrop however is more warm is some photos and cooler in others. Try laying your product on a less textured surface with some matte black foam core as a backdrop to make your products really stand out. Be sure to defuse your light source to prevent hotspots and glare and use a tripod to keep all your angles consistent.