The only strategy that can beat the house is to quit while still winning profits. This way the house can't have the chance to recover the winnings of the player. And best if the player withdraws it and use it elsewhere worthy.
The question is how much profit is enough to quit gambling completely? Most gamblers try to earn huge profits to try and change their lives, but they end up succumbing to the house edge later on and screwing themselves in the process.
Very, very few gamblers get extremely lucky by winning huge amounts and some of them quit gambling as you mentioned and invest elsewhere.