SEO Rich Snippets Lost

Hi There! We are looking for an SEO Expert who would find out whether there is something wrong with my site or not. You are an SEO Expert, you might know what's wrong with my site. A few days ago Google rolled out the May broad core update. After that, I lost all of my rich snippets. Is it something temporary because of the core update or my site is permanently banned for snippets? Because my site content is good quality and many articles were ranking on position 0 for snippets. Can you fix the issue?