Liverpool has a great team, and I agree with you that Liverpool doesn't need to do much in the transfer window since they have a good squad that can compete in the UEFA Champions League competition and the Premier League or any other competitions they will play next season.
It has become a tradition for any club to carry out activities when the transfer market opens, even the greatest teams will enliven the hunt for players to add depth to their squad. Liverpool will look to strengthen their squad after failing in the UCL, especially since several key players such as TAA have left for Real Madrid.
Arne Slot is keen to defend his newly won EPL title by bringing in new players, the arrival of Florian Wirtz will further add depth to his squad's midfield. Several new players have officially joined, perhaps Liverpool will soon inaugurate other new players in preparation for facing tougher challenges in the new season.