I guess all I can advise you is don't make penny bets if you don't have the funds in the casino for them. You don't want to be paying crazy amounts in fees that will wipe away penny winnings.
Or ask your favorite casino to accept deposits/withdrawals through the Lightning Network. I believe it's not just the best time to start asking, it has now become absolutely very necessary as a Bitcoin-only user.
Nobody knows when the mempool will be less congested. Better do not deposit bitcoin for now on betting sites, you need to also consider how high the withdrawal fee can be on custodial platforms. There are altcoins that you can use instead for now.
The network will be congested as long as the "Ordinals thing" market maintains its incentivization flywheel with new money coming in the system, making it profitable for its participants just like a Ponzi Scheme.