I wish it was that simple and clearcut for me. There was definitely a shift, otherwise how can I have gone a year-something without a drink (happily) when before I used to swear blind that that was the last time, EVER! (etc.) and be blacked-out and f***ed-up by the end of the day.
What is working for me?
For a start: Good habits, cumulative sanity, hope, love of friends and family, a little bit of honesty in the right places, the advice and example of others, (good) fear of what would happen if I returned to my old ways, a sense of purpose, abiding disgust at the time I wasted and the opportunities I squandered, a little space of inner calm (don't know where it came from) - not much, but enough, some constant wariness too - I still don't trust myself around booze or bars or boozy people.