Nothing i'm afraid... If you don't have an already open lightning channel and you don't have any altcoins you can use, the only "real" sollution is to pay the large fee.

But if you do pay the fee, it might be a good idear to use it to make a swap to some altcoins or to invest in opening a lightning channel, so at least the next time you can enjoy a cheap fee.

The only other thing you could do is use a free tx accelerator, but those are severely limited and offer no guarantee whatsoever.