For the long term, it's crucial to check the pools' liquidity and smart contract mechanics to ensure TON doesn't freeze during withdrawals. For example, I recommend checking out the selection here
https://betclone.com/crypto/ton.shtml It contains platforms that have already implemented TON operations without unnecessary conversions, so you can place a bet with confidence. Pay attention to projects that have been audited by independent teams, and test small withdrawals before placing large bets.