S3 Glacier (2013) Flexible running without Bucket, want to move to Glacier Deep Archive

I have several S3 Glacier legacy /now Flexible (2013) Vaults running without any apparent Buckets attached. I want to move to S3 Glacier Deep Archive without having to offload/reload all of my data. Is there a way to accomplish this? It seems today Glacier must run via a Bucket? Yes, I am a newbie. I access my data via FastGlacier application.