Sudden Traffic Drop from 1300+ Unique Visitors to less than 200 due to Internal Migration of the Hosting Plan

I did Internal Migration of my Website (stayed with the Same Provider) and From 1200+ Unique Visitors Per Day, The Traffic has suddenly dropped to less than 200. While the Migration, the Server was Moved to the US from EU but Now moved it Back to EU…
Does anything need to change that could reflect true TRAFFIC that I was getting Before Migration? Do I have to update A record with the latest IP Address ? and would resolve this issue or this is Related to some Broader Issue of Migration ?
Can anyone Share Insights or Possible Solutions?

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