Question: how to transfer all contacts from one email to another?
Answer: Head to 'contacts.google.com on your PC.
Click on the 'More' option.
Choose 'Export' option from the drop-down menu.
In the next step, select all the contacts you want to transfer and export it as 'Google CSV format.
Click the 'Export' button and choose the location on your PC where you want to save the file.