Breadcumbs / Sitelinks in SEO

I just noticed that started with December 20, breadcumbs and sitelinks has dropped a lot.
Could be this a reason why my site traffic dropped starting with the same day?


breadcumbs - from 2.400 to 21



Sitelinks: from 2.400 to 1.060


Yoast have changed breadcumb settings on their plugin, could be this a reason?
What should I do? How do I recover these?

Thank you for your time.

any help please?
how do I recover these breadcumbs, what changes should I make?

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