It should be an important match in the second leg but because they have been in the same group before, they have the experience of playing at home where PSG is more favored and it won 2-0 when it was still in the group phase but I hope in the second semifinal PSG can do the same.
Maybe Dortmund will keep an eye on how they fare away from home, it's certainly a tough game for Dortmund but 1-0 on aggregate is enough because PSG will do more than two goals.
Maybe Dortmund will play defense and strengthen their defense.
Luis Enrique should come up with better tactics and stop focusing all the attention on Kylian Mbappe. Certainly, Dortmund wouldn't want to give up a 1-0 lead advantage, but that doesn't mean they should travel to France to solely defend and prevent PSG from scoring. They should also aim to attack, create chances, and capitalize on their opportunities. If PSG manages to score first, making the aggregate score 1-1, then one would expect more pressure from them, which could potentially lead them to victory and the finals.
I'm not sure if home advantage always plays a significant role, especially in Champions League fixtures. If that were the case, then City would have qualified ahead of Real Madrid. I really hope to see Dortmund in the finals, and perhaps Bayern joining them. Football can be unpredictable at times. A club's performance or form doesn't always determine outcomes, especially in competitions like this.