As much as the resident scousers like to remind us that the aim for this season was top 4 and they're still in the fight for that, after 20 games of this campaign they were 5 points off top and 2nd in the league. Now, just 4 games later, they're 13 points off top and lying in 5th, with no wins in their last 5 league games and just 1 in their last 10 in all competitions, having been knocked out of both cups.
Rodgers was replaced by Klopp in October 2015 because the owners were worried CL qualification would get away from Liverpool for a second successive season by keeping him on. As it transpired, they failed to qualify for Europe at all by finishing 8th, two positions lower than Rodgers finished in 14/15, but this was glossed over because they reached two cup finals (and lost).
After beating City on New Years Eve, there was no looking over the shoulder at them, Spurs and Arsenal, never mind United in 6th, and the focus was on keeping pace with Chelsea. After Chelsea lost to Spurs, Liverpool actually gained ground despite drawing with Sunderland, yet now find themselves plummeting down the table, with only 6 teams performing worse than them over the last 6 games (Sunderland, Bournemouth, Leicester, Middlesbrough, Southampton and Palace).
When Liverpool underperformed in the league last season it was because Klopp needed a proper transfer window and because the players were focused on the Europa League, which they lost. When Liverpool got knocked out of the cups this season it was because they were concentrating on the league, which they've not won a game in since 2016. Now Liverpool are struggling in the league, it's because Klopp, despite having three transfer windows now, still hasn't yet been able to bring in who he needs to add appropriate depth to the squad and because like, two players were unavailable for a bit in January. Despite moaning about a lack of depth, the squad doesn't have depth because Klopp allowed 16 players to leave on a permanent basis, with a further 13 leaving on loan, with only 6 coming in, 2 of which were keepers that are being kept out of the team by the old keeper that one was brought in to replace. Furthermore, it's been apparent for a good 3 seasons that Liverpool's defence needs work, so obviously this was rectified by bringing in 2 defenders, one of which is a 31-year-old journeyman, and letting 7 senior defenders leave, forcing Klopp to play Milner as a left-back and Lucas as a centre-back.
But it's not Klopp that's the problem, it's injuries, or international tournaments, or not having a big squad because of a lack of games, or not having a big squad because of too many games, or the population of Plymouth, or United even when they aren't playing United, or the wind.