Ebooks aren't a Mr. Popeill invention where you can set it and forget it. Quite the opposite. You need to pay attention, and keep active, or your garden won't thrive.Everyone experiences slow downs in sales. It's inevitable, and it seems to be cyclical, but not in any sort of way I've been able to prodect. Sales seem to rise and fall for reasons unknown.But if you're doing what you can to make your books discoverable, you have a better shot at sales than those authors who self-publish then self-ignore.