For now I don't think it's a matter of harmony or not but indeed the contracts of some Liverpool players have also expired this season.
Naby Keita, who has already ended up going straight to Ligue 1. Milner is also now certain to go to Brighton and currently Adrian, Chamberlain and of course Firmino are likely to leave as well with a contract that will expire at this time. With conditions like this, it is clear that Liverpool must bring in a number of players, at least to coat their squad, not even ruling out the possibility of finding core players.
Mac Allister has been projected but indeed this is still not enough because of course if they want to be better than this season they have to change for next season.
At the moment there is a foreign name for me because there is the name Ricardo Pepi which is projected to replace Firmino when he leaves but indeed this is still speculation because there is still no further news about Pepi and Liverpool.
Roberto Firmino has confirmed his departure from Liverpool after his stay ends on June 30, and so far Liverpool will only have Darwin Núñez as a centre-forward if they do not find a replacement for Firmino. Darwin Núñez has been very unstable this season, but maybe Klopp will start him as often as possible if Liverpool don't find another striker.
There are rumors about the arrival of a new striker, but so far I think it's just rumours. Liverpool basically have Nunez, but because Nunez's form has been disappointing some times, then Liverpool need to find another striker who can back up Nunez when his form is poor. But I'm sure Nunez will be better next season, but Klopp has to give him a lot of faith.