Use double up feature to regulate the volatility
The double up feature (red/black) gives you the option to double your win with a 50% chance. In some games(like slots from Novomatic) you can do this multiple times in a row. This feature dramatically increases the volatility of the game. From a long-term perspective, you exchange a lot of smaller wins for proportionally fewer wins of higher value.
Example- without using the double up feature, you could win 40 times, winning $1 each time. However, if you used the double up feature up to 3times, you could win 5 times, winning $8 each time. The long-term expected value is the same, but the individual wins are bigger.
If your goal is to win big, then double up feature is exactly what you need. It’s predictable and easy to simulate, I use it in some of my recommended slot strategies.