Please anyone, who will come across this post and is from Turkey and has the same problem, get in contact with us. We can see, that there was a sudden decline of visits about a year ago (April 2023), part of the problem was mobile ISP's blocking CDN77 which we use. We have disabled CDN usage for Turkey and serve the content completely from our main server directly. But apparently there are more problems ;-(
The website gets "ERR_CONNECTION_REFUSED" error when it's opened from Turkey.