You need to migrate your on-premises 12c Non CDB to Cloud 12c.

For migrating an on-premises 12c Non-CDB to the Cloud 12c, conventional Data Pump Export and Import and Transportable Tablespaces are viable methods. Data Pump facilitates the export and import of database objects and data, while Transportable Tablespaces allow the movement of entire tablespaces between databases, streamlining the migration process and reducing downtime.