You can see the activity on their hot wallet address has skyrocketed over the last couple of days, coinciding with the huge mempool spike: https://explorer.bitquery.io/bitcoin/address/bc1qm34lsc65zpw79lxes69zkqmk6ee3ewf0j77s3h?from=2022-04-13&till=2022-05-12
OP's transaction has now confirmed. What I'm more confused about is why he would receive 1 BTC at the end of 2019 when it was worth <$9k, hold it right through $40k, $50k, and $60k, and then send it to Binance to sell during a dip.