Sadio Mane was a very important player in Liverpool's squad. But Liverpool's management and coach could not understand Mane's talent. And so they sold Mane without finding a suitable replacement. And as a result, the performance of the entire team became unstable.
This is simply the sad truth of what happened to Liverpool, but many of their supporters and management would not accept it due to blame. Sadio Mane, Mohammed Salah, and Roberto Firmino were one of the greatest trios in the Premier League when they were still together, but once Mane left to join Bayern Munich, Liverpool's overall performance decreased dramatically and they could not perform as well as they used to. Mane was mostly a playmaker in the attack and a good finisher, but when he went, no one was there to replace the void he left.
However, almost all Premier League teams will make changes to their squads next season. Liverpool management should also add more talented players to their squad. If not, it will be much more difficult for Liverpool to stay in the competition. The team could not qualify for the Champions League. Their aim should be to win next season's Europa League.
If Liverpool works hard enough, they will be able to win the Europa League next year. They have a higher chance of winning the trophy among the already qualified teams for the Europa League. If they can efficiently manage their current team or acquire more valuable players to the team, they will go far and may eventually win the title.