You should make and bring your strategy during the game but somehow, you can’t just use it for every game you do. Not all of them will work with your game and sometimes, you can rely on your feeling instead. Some strategies like Martingale system for your betting money are used to get both of your lost money and also the winning money at once by doubling the size of your betting money whenever you lose the game. However, there is no guarantee at all that you can win the game at once and get them all.
It depends on the game you choose. If you choose the game based on luck, it will not make you successful because you have to spend much and much money without knowing when to win and when to stop using this martingale system. However, when you choose the game like sportsbook or Blackjack, you can get the best chance to win the game without spending too much money for martingale system and perhaps, you just use 2 martingale systems in 2 rounds only before getting what you lost and what you want.
That is why, strategy sometimes doesn’t work for every game of gambling online and you need to decide which one works and which one fails. Sometimes, you can trust your feeling though it will not guarantee you either with victory.