I don't think it's a matter of trying to be an atheist.
It's more of a gradual letting go of God, until one day someone makes mention of God and there is simple reaction of "Nope, I don't believe that." And in the same way that you at one time felt with every fiber of your being that Jehovah was real, you now feel, believe that the opposite is true.
That sense of struggle has come to pass and life is just good without belief.
So perhaps you don't need to try. Just continue doing what you are doing and things will take something of a natural course.