If you have not yet exported data fro your previous account, please see Importing and Exporting G Suite/Google Account Data and follow steps for Exporting Data.
- Log in to the Google Drive web application
- Click the Upload button (small up arrow to the right of the Create button) and select Folder...
- Browse to the Drive folder within the Google Takeout data folder exported from your previous account and click Ok
- You will then see the progress of the upload in the bottom right corner.