Losing more. I realized there's no strategy that can consistently work. If you're in losing streak and your funds are already drain, then it's time to quit. Don't ever try to deposit again just to chase back what you've lost because you'll only regret it.
Your realisation is correct; there is not a perfect strategy that will guarantee winning back what has been lost to gambling. The best strategy at that time to adhere to is to quit gambling for that day and not to make any further bets, as it will result in losing more, adding to the already lost one, because once our mood is affected, the type of gambling judgement we will make will be harsh, and the end result will always turn out to be negative.