My parents did not have a good relationship with alcohol, so as a result I barely drank in my teens.
My 20s were however a different story and I was very much addicted.
I however then got into running, which hugely changed my outlook. I didn't want to drink as I'd rather go out for a long run the next morning, which gave me a much bigger high.
It was a gradual shift, but it then got to the point where I'd only drink on big occasions, like weddings or Christmas. I then had DC and although running is not currently present in my life, I went a few years without drinking at all, and now I'm back to drinking a couple of times a year. Last year it was my 40th in Feb, and I had more in 'one go' than I had had for a long time, maybe the equivalent of a bottle of wine over two days. But then I didn't drink again until Christmas day, when I had two glasses of prosecco and one on Boxing day.
The biggest benefit? It is probably that on a day-to-day basis, I do not think about alcohol at all. It does not even register. It was mind-blowing to me when I realised that that is completely normal for people not dependent on it. No cravings, no "I just need to get to Thursday/Friday/Saturday when I can drink", no day dreaming about what food I was going to eat with my wine, no trying to calculate how many units I'd already had that week, no thinking about how I could convince my DH we should have a bottle of wine tonight, no guilt about how much I'd drunk/the empty extra bottles I'd secretly bought, consumed and hid/anything I'd said/done whilst drunk.
I think it may probably take more than Dry January to get to that point. But one month can easily turn into two, then four, then six months and a year.
It is a good strategy to have something to replace alcohol with; it could be exercise, it could be snacks and a box set, it could be a bath and book.
I also found it easier to deal with if I told myself that I wasn't not going to drink EVER, I just wasn't going to drink TODAY. The further on you get, the more you forget any 'positives' (hint, there aren't any) and just remember how crap it makes you feel.