Just like many other members here have spotted out, the fee used to broadcast that transaction is very low. Observing the mempool for a week now , lowest priority fees have been around about 7 - 9 sat/bytes. Judging from this it may take weeks or even forever for such transactions to be confirmed. However the few couple of options I think you can take is either you convince the sender to bump the fee ( if he initially enabled RBF) . Or alternatively you can make use of accelerators probably via BTC. Since their free service have been flooded with bots lately, you can opt for a paid acceleration.