Unexpected/unexplained change in website session numbers and patterns
I am wondering how to delve into the data to understand why my user sessions (across all sources) suddenly dropped down and have never recovered to their previous rates. We had been doing very little active marketing but showing a regular pattern (weekends/weekdays) and then, 1 week before our first campaign, the numbers dropped off a cliff. Whilst more activity is showing since campaign launch, volumes are far lower than it was when we were doing nothing. How can I understand why and how this happened?