Dortmund should apply their strategy when playing against PSG. They can also defend well if they meet Real Madrid. This is their strategy, not luck as you think. They will continue to use that strategy to face strong teams like Real Madrid.
Luck doesn’t get you to the UCL finals! If it were to be luck, then we would have found the likes of Sporting CP or Celtic in the finals. They are a good side when playing locally but, aren’t that good enough just yet to make these stages in the UCL. Dortmund weren’t lucky, they dared to take the bulls by the horns, went for it and didn’t hold back and they got it. I think their biggest challenge was Arsenal, once they had them off the way, PSG wasn’t much of a threat like we assumed they would be.
Now, they face a real giant in the UCL, a team that knows how to play and pride themselves in the UCL. Dortmund have got to show themselves to be more than exceptional to come close to equal Real Madrid as I think, experience would be where they loose it. I don’t see Real Madrid not winning this, there are players to the team who wants more and more of these medals and trophy. On like in the Laliga, Real Madrid gives some real show in the UCL but, I would be open to some surprises if Dortmund can.