Treat your new WhatsApp-First Business Messaging (Meta) connection as a net-new implementation. You will need do at minimum the below:
Create a WhatsApp Business Account and Channels (Meta)
Create a WhatsApp Template Message (Meta)
Create a WhatsApp Audience (opt-in your Contacts)
Send WhatsApp Template Messages in Journey Builder (recreate all outbound WhatsApp based Journeys)
Create a Default WhatsApp Session Message (Meta) (recreate all inbound WhatsApp based Journeys)
Upon upgrading from Chat Messaging Setup (Sinch) to WhatsApp-First Business Messaging (Meta), it's recommended to delete or uninstall the Installed Package, Chat Messaging Setup, from your Marketing Cloud instance to avoid confusion when conducting WhatsApp Messaging activities.
Support cannot revert your WhatsApp implementation back from Meta to Sinch alone. If the WhatsApp-First Business Messaging (Meta) setup cannot be completed, or your existing campaigns need to continue to send until a migration path is determined, please contact your Account Representative to undo this.
References:
Marketing Cloud WhatsApp-First Business Messaging (Meta) Phone Number Acquisition and Migration
000394586

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