Check out these different methods you can use to see if a domain is blacklisted or de-indexed by Google. It’s also possible for individual pages and or posts to simply not rank. The entire site is not always impacted. However, this can make troubleshooting issues even harder.

Manually Check to See if You’re Blacklisted
Automated Methods to See if You’re Blacklisted
Check Google Transparency Directory

You can always ask Google to review your domain and check why are you blacklisted, but it's always best to use some measures to avoid being blacklisted in the first place.
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