Nunez had perfect performance when he was playing in Benfica and if I'm not wrong he was even the top scorer in the league while he was also a young player with 22-23 years old when he joined Liverpool and that's why he could be a good option for Liverpool and even a good investment for this team, but maybe Nunez was not suitable for Liverpool's systems that's why he couldn't have the same performance we saw from him in the Benfica anymore.
You are not mistaken. He scored 26 goals in 28 league games, making him Benfica's leading scorer in that season. He performed admirably for a young player just starting out. Given that he is only 24 years old and that the premier league is a very competitive league, I think all he needs right now is some time to settle in. He is a valuable asset for Liverpool, and all they need to do is be patient with him because he is still very young and has a promising future. I adore his confidence on the ball, energy, and pace. Given his speed and height, he would fit right in with Liverpool's style of play, which emphasizes long balls and counterattacking. All he needs is time to get used to the new system.