How do you stay consistent?

Ive decided to make a change in my life and stop for good. I drink about 2-3 days a week. Ranges usually from 2-3 drinks to about a whole 750ml bottle of hard liquor(rare). I work a high stress, high stakes job and have never had alcohol a day before i work because my job requires me to be switched on all the time. Its always when I have a day off. Generally have a few drinks of beer/wine to hard alcohol when i know i have a day off the next day. Ive tried to quit several times and have used apps/self motivation but its never worked. So my question is this: What helped you to stop drinking and stay sober?