Tolerance with 2 months abstinence

I have become mentally unstable at the beginning of the year due to my studies and developed some unhealthy unproductive drinking habits (meaning drinking on average 3 times a week until blackout. Around two thirds of a bottle of whyski or equivalent per session for around half a year). My friends began to notice differences in my personality and mental status declining and they had a serious discussion resulting in me getting brought to a psychiatric facility by my friends. The only problematic consumption of drugs was alcohol and the other drug I did was weed but rather lightly (let’s say every second week or so) with an occasional use of drugs like acid, shrooms or coke (irregular, maybe 2 times a year each). I stayed in the psychiatric facility for a month being diagnosed with severe depression fueled by narcissistic personality disorder. Quitting alcohol and other drugs was easy, there is no need for me to use drugs, I did not develop any bodily dependence on drugs but rather I abused it to cope. Also the month after the stay was easy to abstain from alcohol. I started doing more sport to cope and get depression in check. On my weekly hikes I enjoy one joint. So after do month I would like to try alcohol again for social reasons (it’s everywhere in social settings) and to use it as a new start to develop healthy drinking habits and not chug til I pass out. What should I look for, how will my tolerance be changed. Obviously never drinking again is the healthiest choice but is it pragmetically the right Choice?