It's a really interesting question - should one focus on not drinking one day at a time, or never drinking again.
I kind of think it's both.
I had to work through in my head that I was "done", and accept that under no circumstances would I have a drink - no celebration no matter how huge or momentous, no tragedy no matter how unthinkable or unbearable, no milestone, no stressor - there would not be an occasion ever for the rest of my time on this Earth where I would drink again. And I went through that in my head, and accepted it, and was satisfied I had accepted it.
I had to do that, but I acknowledge not everyone might wish to.
However, life is lived one day at a time so I never worried too far ahead of time what might come up to challenge my sobriety. If something was coming up on the horizon, I make a judgment call about whether to accept it or not - say a social invitation. If I accepted it, I'd acknowledge it was there but I looked forward approximately 1-2 days ahead and planned accordingly.