Was the fee too low? I selected the *high* option in my app.. If yes, what's a good amount per Byte to be safe?
It hasn't been too long since you sent out the transaction and at times when the price of Bitcoin climbs up, the network gets a bit clogged, increasing the competition between transactions to get confirmed.
Here's your transaction details on blockchair: 19a0af258f4f6632d5669e7aeb7d515efc24251ae59ffa6e69f74a9ac4a7e961
There's no good amount on feerate, it depends on the state of the network at the time it was broadcast.