Liverpool team players missed a lot of attacks otherwise they don't have to wait until the end, the first attacks had the most chances to score. Mohamed Salah missed two attacks in a row which were the closest to scoring goals, missing such attacks is one of the reasons why Liverpool team lost. Later penalties were one of the reasons for the victory but even then they could not win, basically in this game I blame Liverpool team's luck and their poor performance.
Liverpool were unlucky, but PSG's performance was also quite good. Especially Donnarumma's performance, if only he had not thwarted several chances that Liverpool had, PSG would not have forced Liverpool to take a penalty kick. Diogo Jota also did not perform optimally, replaced by Nunez who lost the ball a lot and misunderstood Diaz. However, PSG did try to spur all their players to play better than the first leg. And they won the match and qualified for the next round.