Posts ranking on Google but barely getting any traffic

Hi folks! My blog has seen a huge dip in traffic since the August Google update. I'm unsure if I was penalised, as the traffic has gradually decreased over the past few months rather than a sudden plunge. Either way, my best-performing posts went from tens of thousands of views to a few hundred weekly.

What's weird is that my best-performing posts still rank for very high-traffic keywords. Is anyone else experiencing this issue?

Thanks!