You might take a look at the automate callback blueprint https://developer.genesys.cloud/blueprints/automated-callback-blueprint/
It uses an Outbound campaign, and that can be set to call back if the first attempt does not reach a live body. You could use some rules to play a different message to the customer on the second attempt. A bit complicated, but probably achievable.
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George Ganahl GCP (Genesys Cloud), CCXP
Principal PS Consultant
Genesys
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