My job has me regualry encountering domestics and alcohol but it still depends on the people involved. It's a good thing that he's atleast aware he has a problem and has tried to sober up in the past(a month at that), which means he's seemingly not a complete lost cost.
However, the big thing here is that you believe moving away is abandoning your father. That's sound like guilt. You are not abandoning him, you are trying to help him. Moving away helps you better your mental and physical health so that you can make more sound decisions first of all. You can still monitor your father and track his progress if you choose. He can try in his own or go to rehab. Moving out is a good choice for your own health and to potentially make your father try and get sober again. Getting sober however, is his choice.
However, the big thing here is that you believe moving away is abandoning your father. That's sound like guilt. You are not abandoning him, you are trying to help him. Moving away helps you better your mental and physical health so that you can make more sound decisions first of all. You can still monitor your father and track his progress if you choose. He can try in his own or go to rehab. Moving out is a good choice for your own health and to potentially make your father try and get sober again. Getting sober however, is his choice.