Help with google search

My site is being indexed by google, however this particular collection :

And search term “the ragged priest”

Does not show up in search , for some reason?

Google say they are indexing it , but it just won’t rank & it used to be on page 1 ?

We have good backlins, good seo and rank well for other search terms just not this “the ragged priest”

Can anyone help troubleshoot what’s happened?

- have we over optimised ?
- is there too many anchor links?
- has someone else tried to blacklist this link? (A competitor perhaps)
- is someone spamming our site with dodgy links?

I don’t know how to troubleshoot & am

Tearing hair out trying to figure out so any help is greatly appreciated