Declining advertising sales have been a big issue but my sales have dropped as well and that should not be happening.
Do you have an idea of the cause of the decline?
It is important to isolate the problem first. Why is your business declining after many years of success? Is it a competitive threat? Is it a tired business model or stale value proposition? Have you been eclipsed by better options?
Once you figure out the "why" behind the decline, you can move towards developing a solution to correct course.
What is your business and what industry are you in?