Soberella - I stay vigilant in an indirect way. I don't know if it would be considered 'vigilance' per se, but it more of maintenance. Rather than focusing on 'not using' I focus on improvements to sober life. Exercise, diet, meditation, etc. are things that I do which are my way of indirectly remaining vigilant. These are things that I thought of as chores / boring in the past, but I genuinely like doing them now. If I didn't enjoy doing them I would have probably given them up after the first day.
I do pre-plan things so that I can avoid triggers whenever practically possible. That is really the only thing I would consider 'vigilance'. Also, I take HALT very seriously and do everything in my power to avoid letting myself get in that state. To be honest though, it isn't so much about using HALT to avoid using it is to avoid feeling like garbage.
I only have 2 1/2 months clean time so this might all be rubbish that gets me face planted next week. It has worked so far though.