OP does not mention dependence issues, his drinking is not even habitual and the effects on his social life or personal health are minor. All the advice about 12 step programs, lifestyle changes with exercising and teetotaling is going overboard b/c that is clearly not what OP asked about.

Op wanted tips on how to drink "sustainably", I find that drinking light alcoholic beverages is harder to control than hard liquor both for physical and social reasons (more social pressure to drink "light drinks", more stigma on "liquor")