Kubernetes going from single instance to clsuter

Hello everyone, I was using for my production environment a single instance of neo4j running on Kubernetes, but due to workload increase, we upgraded to a cluster.

The problem now is that the original instance has a lot of data, but the new ones don't and so they do not even start. I looked through the documentation but there is no information on how to convert from a single instance to a cluster, only how to add more servers to already running clusters.

This is the error message i'm getting:

Database neo4j-0 is the original one, which gives a FAIL status, whilst neo4j-2 gives a sucess status. Do you have any idea how I may solve this problem? Thank you in advance