As someone who is 5.5 months in, I was there not long ago. I struggled for the longest time to make it past 90 days and would reach a point where I convinced myself I could just do it every now and then or just for a few days then stop. Those times were short lived, and I was back at it full fledged. I think the paragraph at the bottom of page xxvii in the Doctor's Opinion describes it perfectly.
“Men and women drink essentially because they like the effect produced by alcohol. The sensation is so elusive that, while they admit it is injurious, they cannot after a time differentiate the true from the false. To them, their alcoholic life seems the only normal one. They are restless, irritable and discontented unless they can again experience the sense of ease and comfort which comes at once by taking a few drinks—drinks which they see others taking with impunity. After they have succumbed to the desire again, as so many do, and the phenomenon of craving develops, they pass through the well-known stages of a spree, emerging remorseful, with a firm resolution not to drink again. This is repeated over and over, and unless this person can experience an entire psychic change there is very little hope of his recovery.”
For me, it took the complete psychic change and getting out of myself. I heard a guy say in a meeting recently that you can start working any step that starts with a 1 at any point and for me that's what it took to get past that hump. At 6 hours sober, you're further along and can help a guy that's only 2 hours sober. My sponsor asked 3 things of me from day 1
1. Read at least two pages of the book a day
2. Call at least 2 other alcoholics a day
3. Thank my higher power every night if I make it to bed sober and when I wake up and ask for guidance to do it again
My advice (at least what's worked for me) is to make those calls and find ways to be of service to others or your home group. Even a small task like taking out the trash or sweeping up butts at my homegroup provides relief from the bondage of self. I don't have all the answers, but I know following my sponsor and the guys ahead of me and doing what they do and trying to show it to the next guy has kept me in line longer than anything else I've tried on my own has.