Enter your destination account (your personal gmail account)
Click on “Send Code” - this will send a code to your personal account
Log into your personal account to get the email with the verification code. Copy the verification code
Go back to the “Transfer your content” screen and paste the code and click on “Verify”
This process just confirms you have access to the account you are sending the data to.
By default both Drive and Gmail are selected. You can click on the blue button to turn off a feature.
Click on Start Transfer. This process can take a while especially if you have a lot of files.
NOTE that you can not transfer contacts using this method. If you would like to download your contacts (which you can then upload to your personal account) use the directions found in the article Export Google Data with Google Takeout
Also note that this will only transfer Docs/Sheets, etc that you created. If an item was shared with you, it will not transfer.