If the strategy needs to be changed, especially repeatedly, it means that none of these strategies are working. This is because there is no strategy that can manage random events. After all, then random events would cease to be random. So it's useless to look for a winning gambling strategy based on luck. A gambler's strategy may be to manage the bankroll in order to gamble responsibly. However, in some games where skill is required, or in sports betting, different strategies can be successful.