Thanks HCP. I made the two transactions separately from blockchain.com and made sure that for the second transaction I had enough bitcoins for the transferred amount as well as the fee. I don't understand why I would be spending the UXTO from the first transaction.
Because blockchain.com allows spending of unconfirmed "change"... You haven't really done anything wrong per se... it's just an unfortunate set of circumstances that have resulted in both your transactions getting held up.
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.