I've struggled with depression since my teens. I've also been drinking since I was 12, first got utterly wasted when I was 13
Alcohol is a well known depressant, personally I believe I have a propensity to depression and the booze just made it worse. Much worse probably.
I'm seven months sober, the longest stretch I've gone without alcohol for 40 years.
I'm also currently enjoying the longest stretch of uninterrupted good mental health for as long as I recall. Melancholy occasionally pays me a visit but it's not depression.
Is it coincidence that my depression has lifted entirely at the moment? I doubt it very much indeed.
Ps, I'm not on any medication, quite high on life I'll admit but not a prescription in sight.