scale Cassandra cluster and redistribute data

Author: GrandVizier

Originally Sourced from: https://stackoverflow.com/questions/74370739/scale-cassandra-cluster-and-redistribute-data

I have a single node, single replica cluster. I'm looking to scale it up to have 4 nodes, with a replica factor of 2. The ALTER KEYSPACE command works the the replication, but how to I distribute the existing data across nodes?