Great job on 11 days! It's never a cake walk, but it does get easier.
I can't speak for myself as I have under a year as of today, but the common theme for people who go "back out" is that they got complacent. They stopped putting in the work (and staying sober IS work), they stopped being honest with themselves, they didn't hold themselves accountable, etc.
As for thinking that far ahead, though, my advice is to treat it the same as drinking - don't do it. The saying "one day at a time" is popular for a very real reason, and that's because the thought of doing this forever can become daunting, and cause needless stress. Vow to not drink today. Then be sure to make the same promise tomorrow, and so on. We only have today to tackle this, so do the absolute best you can to fight this thing today, one day at a time.