I try to stick to the CDC guidelines of 1-2 drinks per day. I occasionally make exceptions for special occasions (e.g. birthday, family in town, etc.).
If you have a spouse or housemate, or even a good friend that you keep in touch with regularly, ask them to keep you accountable. Express your goal and have them check in every month or so. I know my wife will tell me when it becomes a problem, so I'm a little less concerned than I would be if I lived alone.
If you have beer on draft, use a smaller glass. I often use an 11oz glass, which holds 9oz of beer plus head.
As others have said, focus on lower ABV styles. Berliner weisse, gose, saison, English mild, etc.