Yes therefore in order to become champions liverpool need to improve the quality of the game. Liverpool defense is still very fragile, in the next transfer window I believe liverpool will buy defender.
Thry need a goalkeeper and that is always their main problem, I have seen that sometimes even with top defender on your side there is no guarantee how things will turn however if they got a handy of defender alongside a top goalkeeper than that would be the best choice for their problem
Liverpool need a deep squad too to be able to win the title, so whenever one or more players got injured, the players from the bench can take over the position without decreased the game quality. The substitute players should have the same quality as the starting eleven since Liverpool has to play at more than one competitions.