Hi, okay, i am willing to pay $400, that’s fine. What do i need to do?
At this point, I would be tempted just to wait. The difficulty significantly dropped yesterday as expected, despite hashrate continuing to increase, thanks to the previous drop in hashrate two weeks ago. If you look at
https://jochen-hoenicke.de/queue/#BTC,24h,weight, you can actually pinpoint exactly where the difficulty dropped, as the mempool starts to rapidly clear. The mempool has decreased by 30 vMB in 12 hours. If this continues without any major changes, then we could be back down to the 2 sat/vbyte level within the week. You've already waited 19 days - what's a few days more for the sake of saving several hundred dollars?
At the very least, if you wait for the mempool to clear a bit more than the fee you need to pay for acceleration will be cheaper.