piano community site is getting aggressively de-indexed by Google

Google Search Console shows me that the site is being aggressively de-indexed with most pages now "Crawled - currently not indexed". There are no manual actions or any red flags that I could see in GSC... but manual indexing requests or re-validation hasn't helped. Bing seems to be quite happy with the site. Based on all that I've read, it seems my case is completely hopeless? Or is there anything actionable I can do here? Thanks a lot for any help you might have.