RBF is not enabled, so you cannot bump the tx fees for these transactions, though you can use ViaBTC transaction accelerator to get it confirmed faster, just submit your transaction id here.

I don't know what the fee rate was when these tx's were broadcasted, but the tx fees used are not too low and they have been in the mempool for somedays now, from https://mempool.space/, high priority is ~ 30 sats/vByte right now, i guess it should be confimed soon if the fee rate doesn't go up too much.

What is xPub and how do I get it?
xPub is extended Public key and you can use it to create your receiving address for receiving. You can not sign any transaction to move your coins. You only can sign transaction with a private key.

You can get Secret Private Key Recovery Phrase for your blockchain.com wallet and import it into Electrum wallet.
You can bump the fee with Electrum too.
How to restor Blockchain.com wallet into Electrum
https://electrum.org/