How to unstuck a low-fee transaction with blockchain.info?

[Bitcoin]

How to unstuck a low-fee transaction with blockchain.info?

I've sent a transaction from blockchain.info, but accidentally included too little fee. What can I do to cancel the transaction or speed up the transaction's confirmation?

^{This is a complementary question to Why is my transaction not getting confirmed and what can I do about it? which answers the question's broader implications and proposes mitigation mostly focused on Bitcoin Core.}

Source: How to unstuck a low-fee transaction with blockchain.info?