The liver is the one organ in the body which can regenerate itself if you stop abusing it.
I was diagnosed with fatty liver a couple of years ago, which was actually a relief because they had suspected liver cancer.
Jaundice - you turn yellow - is a sign of irreversible damage, I've been told, but up to that point your liver can improve if you stop drinking.
The other thing to consider is that in order to qualify for a liver transplant a sobriety period is required; where I live it's two years with zero alcohol. Many drinkers have managed to do that. If they could quit to qualify for a transplant, they could have quit to keep from having to get one.