I quit after a serious addiction of drinking 20 pints of beer a day for years. My brain felt damaged and I was powerless to stop.

You have to really really admit you are a loser alcoholic. Not to feel sorry for yourself but to admit that you cant carry on like this and you might as well be dead if you continue... THEREFORE you stop and get another shot at another life.

Start going to AA or alcohol recovery groups in your city. Simply the routine of going a couple times a week and speaking to fellow alcoholics can make you feel like you have some routine in your life. I figure since youre a problem drinker you struggle socially and isolate yourself. AA is a low stakes social meetup where youre expected to be mentally broken

you need to start exercising regularly and find things to do to take up your time. For example on weekdays walk 30 minutes each way to a library where you can read 1 chapter of a book, then relax on youtube for 30 minutes or so then walk 30 minutes back home. This will take up 2-3 hours of your day.

Slowly build up healthier habits but keep things low stakes, watch lots of tv, eat good food, meet up with people, attend AA. Alcohol recovery takes a few years before you get anywhere close to baseline levels so you gotta keep it easy. Theres no rushing to recovery