Maybe the "30 million" visits were an anomaly (bullrun, bots, signature campaigns, etc...) and now the 3 million visits are more normal ? What were the figures before the bullrun of 2017 ?
That drop in number of visitors is completely normal. Look at the chart below
The chart shows how much "Bitcoin" has been searched on "Google" over the time. Number of searches has been decreased by 90%. There is a same trend for number of visits of Crypto-related websites.
