Others have already posted here the main links containing the steps to follow.
If you say xianity held you back from serious advancement and a better life, it means you have received a good dose of mind programming in your early life.
The best step you can take is in your mind, by deprogramming. There is not only meditation and spiritual work to get it, but studying is paramoing, like reading the section Exposing Xianity more than once for example.
it is not only a matter of conscious understanding, that you already achieved, because you state that xianity is a scam to be erased.
The true freedom from this odious program, is unconscious freedom, that may require longer to manifest.
Me, personally, I read the whole of ToZ (JoS) at least 5 times, and at least a couple of times all the books on the Library. This is because my unconscious was heavily tied to xian teachings, because of education and programming. You will find also some good audio files of the such, should you prefer to listen instead of reading.
It's like de-hypnotizing yourself. You may need to repeat concepts to your mind, to break free.