But for real sometimes I would leave some and play for fun maybe like 1/8 or something of all of my money in the gambling site.
It is better to take the profit and leave because that is the only thing left for us to do when we already win some money. I wouldnt risk anything at all because we cant win in gambling. We ca have fun but we cant win so if the profit is quite high then it is better to keep it but for me most of the time my profit is small enough
If we already profit from gambling we should stop gambling even a little. Our profits will disappear again if we continue to gamble. We keep some and stop for a while. And if we want to gamble again continue on the next day.
That's what I do usually when I win the size of my bankroll. Only I don't play the next day, I don't gamble so much. Sometimes a week or even more can pass until I gamble again. My advice is to never play with your profit the same day or otherwise you will lose it most likely.