In fact, it is difficult to understand what exactly influenced traffic from Google. Here are the statistics from the old site:

And these are statistics for a relatively new site in a very competitive topic:

If you compare your graphs and my first one, they are similar. But there is a possibility that the problem lies in the emergence of a gigantic number of sites on various topics that are generated by neural networks. Because of this, competition may have increased. I am observing several sites that are filled with neural networks; in just 6 months their traffic has grown to 10-15 million per month. They publish from 100 to 1000 new articles every day, and it is still very difficult to compete with them. We hope that Google will begin to identify them.