Gambling sites usually use high fees when you are withdrawing from them but it's interesting they only used 21 sat per vbyte. Mempool is going back to normal slowly but it will still require good amount of time to get this transaction confirmed. I think you have no other option but to wait.
hey i sended btc from 1 bet site to another sadly the first did sent with way to low fee now its stuck and i cant acclerate it or use viabtc cuz volume is over 0.5kb anybody who could help accleratae it ? thx in advance
I assume that gambling site has customer support, and the only option you have at the moment is to contact them and ask them nicely to increase the fee, because the transaction is marked with RBF. On the other hand, you can hope that you will be lucky with mempool because currently transactions are going through with about 30 sat/vB, and yours has 21 sat/vB.
I dealt with may casino customer support and unfortunately I found none of them have good knowledge about blockchain and how it works. The chances for this casino support will be slim too.
@OP, which one was the site you withdraw the balance?