Online gambling you say?
Not sure what site is best for you, but you must use a decentralized crypto currency from the blockchain. You can lever up on the defi with swaps and the only risk will be the gas fees. Air gap your wallet and you'll be stacking sats like a 9 year Hodlr. Avoid fiat since it's manipulated by the banks, instead use altcoins to show your proof of work or proof of stake. Within a few months you will be using smart contracts to breach toll bridges with your stable coins in a stealth mode that doesn't allow the fiat police to track your stake. You will have a hashrate that mimics the fungible version of virgin vaporware. Honestly, with this methodology, you won't have to win a single bet, you will be a whale fatter than Satashi Nakamoto himself.
It's really pretty simple and it's the future.