Honestly, if someone thinks they need to win back what they lost, they've already lost control and recovering everything is almost impossible. From my own experience, when my funds are gone or there's nothing left on the casino site, I can take a break and come back later or the next day. I can't keep funds sitting in the casino because sometimes I carelessly spend them too quickly, even without winning anything at all.
I think this is a very common problem for many players, because almost no one wants to limit their time playing. Gambling is primarily associated with entertainment and relaxation, and it's no secret that players imagine castles in the air where they'll win huge sums, but in reality, this rarely happens. I've been gambling for a long time, and I've learned through experience that there's nothing better than learning to limit yourself—not by forcing it, but by carefully considering it—and also by limiting your losses per session. For example, I don't allow myself to play more than an hour a day to keep a fresh perspective on the game and avoid getting stuck. The same applies to losses, where everyone can set a limit for themselves per day, week, and so on.