#3 Mentality
We have seen it during many games this season and even during the last Champions League final against Real Madrid: Liverpool haven't yet discovered a championship-winning mentality.
When Liverpool were gunning for the Premier League crown during the 2013-2014 season, after that slip the team crumbled and eventually lost to Manchester City in the title race.
This season the pressure is on again because of the team quality, the way they play and the last Champions League final that set the bar really high. The recent signings, including Alisson and Keita, have given them a boost too. But it remains to be seen whether they can actually get the job done.
If Liverpool get to the end of the season with no title, the question will be raised again: Is it worth it to keep Klopp considering he hasn't won a single trophy since the team hired him?