Mathematically the best way to play roulette is to put your life savings on black, once.

This is because the odds tend towards the house in the long run. No strategy is above a 50% win rate by design. Assuming you have the money to cover it, playing some 49% win strategy forever will result in you keeping 98% of your starting money.

The 49.8% chance of doubling your money on the first spin is the best chance you will ever have at the game.