one of my site used to rank very well on google for a few years now, until 3 months ago- then, for some reason, traffic slashed by 90%- and, there's NO black / grey seo whatsoever, all is white. These days, my site receives a small amount of visitors from google, and everything i try to do doesn't help. The fact that I still get traffic suggests to me that my site wsan't penalized- just was hit by some kind of filter.
I fear that Google has a "memory" and it flagged my site for something I'm not aware of, and it remembers that, and doesnt let go? I wonder if anyone had a similar experience?
I changed everything I could have thought about. Yet no improvement from Google.