"Enable Enterprise Geodatabase" is used to create the Enterprise Geodatabase, not for Data Migration between two geodatabases.
If you want the Domains, Subtypes and Related Data to be migrated as well, you can go ahead with the below options:
1. Copy\Paste data from the File geodatabase into the Enterprise geodatabase
2. Use Import\Export as XML Document (Export the data from File geodatabase as XML Workspace Doc and then Import it into the Enterprise geodatabase)
Overview of copying geodatabases—ArcGIS Help | ArcGIS for Desktop