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Indeed after Sadio Mane left Liverpool, the quality of their play deteriorated noticeably..... Although towards the end of the season they were able to achieve some good results... Let's hope that the new players can add some good moments next season and Liverpool will start playing well from the beginning....
I think Liverpool's dip in form was coincidental although some believe it was due to Mane's move to Bayern Munich. I'm not too sure about that assumption, but Liverpool's performance has indeed decreased along with Mane's move. Liverpool have quality players like Salah, Nunez, Firmino and others. However, the decline in their performance was basically not only due to Mane's movements, but because the players there were not in good form.
Nunez, Gakpo and several other players have helped Liverpool as much as possible to return to their best form, but it's difficult because they have fallen far from the Champions League zone. Liverpool will be better next season, I'm sure of that.