A 1 yr. lookback report on Anonymous users revealed this:
I suspect the spike at July 31st will always be a mystery, but clearly something happened in the March 13-20 week. Anyone else experience something similar? Any ideas on root cause? We’ve done nothing with respect to marketing, hosting, etc. Business as usual except for this.
(our site has nothing to do with health, coved etc.)
Can you check your stats (Google Analytics) to see where the majority of pre-March 22 traffic was coming from? Perhaps a crawler? Bing comes to mind.
Here’s Bing (only) from Jan 1 till now:
Here’s Google (only) same time period:
Looks like a drop of about 40% in crawler users for Bing and similar for Google corresponding to the same time in your first graph. How do the pageviews per crawler look here
Can you break out by country?