Better is "Why aren't we doing X, Y, and Z to improve sales?" That phrases it in a positive tone, with concrete solutions, and gives the CEO an opportunity to tactfully tell you why your model of the world may be wrong.

Beware that very often the response is "Well, I never considered that, but it sounds like a good idea. Why don't you lead a project to do X, Y, and Z and we'll see how it turns out? Oh, and be sure to get your regular work done too."