There is no strategy for roulette ?
There is no strategy for roulette because it’s impossible to predict what’s coming next. The numbers that have come up recently have no bearing on what numbers are about to come up. The clue that this is true is that most casinos have a marquee showing what numbers have recently hit. That means the casino is playing you. If looking at past numbers helped, the casino wouldn’t be happy to broadcast those numbers on a big sign. The house edge is the same whether you use the marquee or not.
This means, for example, if Black has come up for the last 10 spins in a row, the next spin is not more likely to be Red. Black and Red are still equally likely. There’s an old saying, “The wheel has no memory.” That means it doesn’t know what it spun before, and even if it did, the wheel can’t select what number comes up out of its own volition. There’s more on this in my article at UFABET

Here’s another example:
Since there are 38 slots on the wheel, we expect any given number to hit 1 out of 38 spins on average. Now let’s say you’ve been playing Roulette for a few hours, betting on Red every time, and you’ve been keeping track of what numbers have hit. There have been 152 spins (4 x 38), and so we expect that each number should have come up 4 times on average. You note, with some surprise, that #14 hasn’t come up at all. Does this mean that #14 is “due” and that you should bet on #14? No. Number 14 is not “due”, no number is ever “due”. The wheel has no memory.
One last example: You’re betting on #27 every time, because that’s one of your lucky numbers. We expect it to come up once every 38 spins on average. Luckily for you, it comes up on the 15th spin, making you a tidy profit. Should you now start making other bets instead, on the assumption that #27 won’t hit again soon because it just hit this time? No. You can certainly switch to another number if you want, but that won’t improve or worsen your chances. The chances of #27 coming up on a given spin are the same, whether it just come up on the last spin or not: 1 in 38. I’ve seen roulette numbers repeat plenty of times.