Click on full report, and see if the impressions went to 0 as well. if the impressions went to 0 it may mean that you got penalized, but you have to check a lot of things before you say so.
Check the following
- Double check that you sitemap is working well and added to GSC
- Check Core Web Vital and see if you have an issue
- Check the HTTPS
- Check the indexing pages (to see if your pages/posts are indexing)
If you have impressions but 0 clicks, then it means your website decreased in ranking and you should analyze your website to see where the problem occurs:
- Do an SEO technical audit
- Double check your titles and update them
- Update old content and make them better
- Disavow any bad quality backlinks