You will never win at Roulette if you accept the odds a casino will pay. You have to accept better odds than those offered. That automatically means that even money and 2/1 should be excluded from your betting.
The best odds games are the ones offered as returning 5 times investment. But instead of accepting 5/1 you act as if the odds are only 4/1. For example, if you are betting to win say 20, you should bet 5 and not 4. This way, when you have a collect you win 25 and not 20. If you lose, you are setting 25 as a target next move and pretend odds of 4/1, you will invest 7, to win 35.
Of course you will strike times when you go 20 or more losing spins but less than 3% of times. When this happens I can show you a way of getting back to winning.
There is not enough room here to demonstrate how this works, but you are more than welcome to email johnryan6645@gmail to try me out.