With a squad like Manchester City, Nunez might have scored a lot of goals. Not to say that the Liverpool squad is weak. However, since Sadio Mane left the team, Liverpool's performance has completely collapsed. And their performance was very erratic. Because of this, the team has not consistently performed better than Nunez. However, in the last few games of the season, Liverpool played very well and their performance was stable. Therefore, it is expected that Liverpool's performance will not be irregular in the next season. At the same time, Nunez will be able to score a lot of goals if he gets enough support from his teammates.
I too think Liverpool performance has dwindled after the departure of Sadio Mane to Bayern Munich and they haven’t quite recovered fully enough from it although we can’t actually classify them as a weak team. I still believe Darwin Nunez still has a role to play at Liverpool and perhaps doesn’t get enough support from his teammates like you noted.
With a squad like Manchester City, I believe Nunez would definitely have scored much more then he did. Nevertheless, the next season would probably be better for the lad and in general for the club if they could maintain some sort of consistency in their performances.
Liverpool started making more individual mistakes. Simple and avoidable mistakes that should not ever happen on that level, but when I watched Liverpool games they were also out of this craving for success that you usually could see in their faces. Sometimes even Klopp seemed to be puzzled about the mistakes that his players made. As if they were tired and drained. When they conceded a goal some years ago it almost meant nothing. Everyone knew that they will turn it around with every second that is left and so often they did it, but this has been a different Liverpool for some time now. I wish we get the old Liverpool back soon.