Thanks for the response.

My Blixt wallet is connected to 4 peers. If I press + I have the menu "Connect to lightning peer", asking for node URI. If I type in the node public key of one of the nodes in the list I get an error message saying I am already connected to the peer.

I suspect it's the low fee in sats (less than 1500 sats) that is causing the tx not to be mined. I see RBF is active on the tx so I might have to bump the fee up.