Unfortunately the eSIM QR code is unique and can be used only once. If you delete it for any reason, you need to buy a new eSIM.
To install eSIM, please scan the QR code (it can be found at More Details> QR code at the Line's managing panel in your account - https://myaccount.simfinity.ai/ ), set Simfinity eSIM as a Primary Data Plan, and enable Data Roaming.
Then please contact us at support@simfinity.ai to transfer the unused data to the new line.