Using a webwallet makes it harder for you to be able to do anything about it... because, to my knowledge, blockchain.com wallet doesn't allow you to use RBF... and you can't guarantee that a CPFP transaction would work either unless you shifted your entire remaining balance to be sure you were spending the change UTXO.
Apparently your first transaction has already been added to the ViaBTC queue, so it's really just a matter of waiting for them to find a block or two at this point and it should get a confirmation. Then you can try and add the 2nd to the queue.