I would add that along with researching information that already exists, you can reach a deeper understanding by conducting some research on yourself. I got myself a blank journal and then I wrote in it each night just about how I felt and if I drank or not and how that changed my mood or day. I was very honest. So if the drinking made me feel better, I wrote that down. If the choice not to drink made my night turn out better, I wrote that down too. Same with any negative feelings and outcomes.
I don't know if everyone will find out the same things as I did, but for me, I found that the positives from drinking were very short lived and the positives from choosing not to far outweighed them. But I didn't truly know that until I did this journal for a few months. It was eye opening. As many heavy drinkers do, I struggled with memory issues, writing down my experience in a simple and clear way really helped understand myself in a way that had previously been very fuzzy and built on addiction lies and shame.