My website is struggling with falling traffic after being placed in ICU by HCU. Anyone have any good news to share?

I initially thought a 40% drop in traffic was significant. However, it has now plummeted by 70-75%. My website, which is 9 years old and has a large following on Pinterest and Facebook, has never encountered such issues before. Our content is consistently high-quality. I am baffled as to why Google is causing this.