A good month can happen by accident. A good year can't. The difference between the two is architecture — the structure that turns one-off wins into a system that produces them on purpose.
Unarchitected revenue looks fine on the way up and can't be diagnosed on the way down, because nobody built the thing that would explain it. It's luck in formal wear: presentable until it stops showing up.
Architected revenue is instrumented. You know which system produced which dollar, which input moves which output, and where the next dollar is supposed to come from. That knowledge is the whole difference between a business and a streak.