I had exactly this struggle, although my daily consumption was slightly lower (2 to 5). I tried all the standard tips: exercise, nutrition, etc. Despite making me much healthier, these things never diminished my appetite for my nightly drinks, although I was able to abstain for weeks at a time. I also had a big appetite for caffeine, which I had no reason to believe was related. Surprisingly, what worked for me was getting an actual diagnosis of inattentive-based ADHD when I was 31, at the prodding of my girlfriend who recognized the condition, for which I now take a prescription time-release stimulant. A side effect I was not expecting was that my desire for caffeine and alcohol both dropped to near zero overnight. I do not recommend experimenting with this if it is not a condition you legitimately have, but for me these things were all clearly related.