If there was a guaranteed way to win at any casino game, the game itself would cease to exist, but there are always things you can try out that might just work for you.
For roulette, either raising or lowering your stake after you lose and doing the opposite when you win is a strategy some players use.
Another one entails taking your bankroll (the amount of money you’re going to spend) and dividing it into thirty-eight pieces (for American roulette). The idea is to then bet on the same number all 37 times.
Whether or not these strategies work is for anyone to say. Ultimately though, it boils down to your own judgement and a bit of luck.