Wanting to be a person who has No desire to drink

I’m working through the December work (slowly) but I am feeling stuck with choosing my impossible. I feel like something that is very important to me is to become a person who no longer desires to drink. Even in typing that out though it feels overwhelming! My question is if I choose this as my impossible, how do I go about measuring the achievement? It doesn’t feel like other goals, such as money and weight where there are tangible things to measure such as dates and quantities. I am stuck from one perspective that it truly does feel impossible but also if I go down that road and believe it may be possible, how then do I go about the rest of the work for setting tangible and measurable goals? Thank YOU!!! I reviewed alot of the previous questions but didn’t see or missed one like this.