Sales always have ups and downs, in any online or physical market, they depend on many factors.
In this time of year, many people around the globe are enjoying holidays. So, you could take advantage of this and learn some skills, develop something new, or do something you like
At least this is something I always do when I am not busy replying to support/change requests. Meanwhile, of course, Envato does the marketing part, improving search and other factors, so this is not something we can influcence.
Regarding the copyright issues and items being copied from other authors, please remember that in the forums, discussions about piracy and this sort of copyright are not recommended: https://forums.envato.com/tos
While the intention of such matters being quickly posted/discussed in the forums is really appreciated, please report any/all copyright infringement related issues to Envato Help Centre