Good question. I never experienced that it took longer than 14 days. The effective fee rate of 6.00 sat/vB seems not that bad (I have seen 1!). It always stays in your local mempool. In case you restart your node be sure you do a rescan putting reset-wallet-transactions=true in your lnd.conf. Yes the location is hard to find in umbrel. It is: umbrel/app-data/lightning/data/lnd/lnd.conf.

But in your situation I would not worry too much. Just have patience 👍