Drop offs in views happen when everyone who wanted your items have already downloaded them. It's bound to happen eventually with every item we post. It can sometimes help to re-advertise items that are loosing viewership on other sites to bring in more people to your gallery. I don't reccommend readvertising any item that hasn't been online for at least two months already just to avoid spam issues.

It is a miracle that curiosity survives formal education. - Albert Einstein