Anecdata, but of the people I know most report that significant promotions only come from job hopping, never from staying in one place. I'm glad that this hasn't been true for you, but based on hearing many stories that are unlike yours and very few that are like yours, I think your case is unusual. Hard to phrase 'you got lucky' in a way that doesn't imply it was just luck or that you didn't work hard (and that the hard work was a necessary step).