I hate to be the one that delivers bad news but such abstinence as referred to above will do less than **** all to actually repair your liver.
If your car has bald tyres and one doesn't drive them then the thread does not re-appear, the tyres are fúcked. Further driving may render them even worse but less does not correct them.
If your liver is in a state of ill repair after 30-40 years of alcohol abuse then 1-2 nights a week is like a raindrop falling into the ocean.