I run a small news/publishing company xyz.com, which is my parent company.
Under xyz.com i run several brands:
abc.com
efg.com
ijk.com
lmn.com
In all of these sites i use the email of info@xyz.com as contact address.
Now, after the March Google Update 2024, all my brands under the parent xyz.com lost their ranking.
The traffic is almost ZERO for all sites.
I want your opinions and help to detect and recover from the penalty.