Can I undo a transaction? Limbo LBRY token

Greetings. I sent LBRY to what I thought was an external source to see how things were working however they didn’t reach the address sent to. I can trace them through the blockchain but they end up here. I cannot find how to undo it or put them back into the account. Can anyone assist? Thank you in advance! LBRY big fan wish I could figure out how to differentiate between my content and others content I compile so I can get credit for mine. Thank you
This is the transaction chain. LBRY Block Explorer • Transaction

Where did you find that external source address ? Transactions cannot be undone, they are final once confirmed.

Would be good to know where they were sent.