Why one of my top pages dropped?
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Thank you Everett, I understand, I started this thread thinking that just one page of my "category pages" had a rank drop, and that was the "violin sheet music" optimized page. Hence the confusion, my fault. Then, after further research, I discovered that all instrumental category pages dropped in a similar way, therefore I begun to see the problem no more "keyword relate" but "quality related"... here we go

In any case, yes, thank you for the tip, I'll check my internal links. I know that we have overoptimized those a big deal in the past years, and we may want to "de-overoptimize" them a little bit.
And yes, as I am discussing on the thread below, I have currently "noindexed" all those pages while we are working on a redesign of them:
https://moz.com/community/q/can-adding-noindex-help-with-quality-penalizations
Hopefully that'll make most of the trick.
Thank you again very much, I appreciated your help!
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I almost forgot: about Internal Links, please, have a look at this discussion I am having here below:
https://moz.com/community/q/rankings-drop-and-google-search-console-internal-links-panel-correlation
I'd love to know your thoughts about it. Thank you again!