Liverpool were too unstable throughout the season, why this happened is not clear, but sometimes teams have recessions. At the end of the season, it looks like Klopp has found a way to approach the players and the team has found its game, because at the end of the season they were again like the old Liverpool. How they start this season, we'll see, Klopp requires players to give everything in every match, it's hard to keep up with the whole season, so the team needs fresh players.
Injuries were Liverpool's main reason, and therefore the few players entrusted with filling that void didn't have a good impact on the results. Liverpool weren't lucky enough about Nunez either, I mean he had a hard time adapting at Liverpool because of the language barrier. Those are just a few things that I know, but at the end of the season Liverpool found their best form again to finally qualify for next season's European Conference League.
Jürgen Klopp was responsible for the team's performance last season, so he will have to work even harder to improve next season. Liverpool is a competitor for Manchester City even though Liverpool have found it difficult to stop Manchester City's dominance in the Premier League in the last 6 seasons.