Interesting to see that most traffic is coming from Russia lately. And I highly doubt bitcointalk is in trouble. I'd like to ask OP when the forum was getting 30 million views per month. That was probably in 2017?
SimilarWeb numbers are BS and have been previously debunked in another thread started by the OP, I just can't be bothered to find it. You can refer to ad stats for a more accurate trend:
https://bitcointalk.org/adrotate.php?adstats