Klopp joined Liverpool in October 2015 with the club 13th in the PL. Having inherited Brendan Rodgers' squad, he saw them finish the season in 8th. To rebuild, FSG made wholesale changes from the front office to the first team, and they experienced their fair share of poor form.
Despite having a clear idea of which areas of the team needed strengthening (in particular, defense), it obviously didn't happen Immediately. Liverpool finished the 2016/17 season in 4th place, having conceded the 2nd most goals of any team in the top 7.
Ahead of 2017/18, LFC spent big [£168m]. But Klopp's side were still very much a work in progress - conceding 16 in the first nine (including a 4-1 loss at Spurs with Lovren subbed on 30'). They signed van Dijk in January, righted the ship, finished 4th and lost in the UCL final.
Having sold off dead weight (£185m) in 2017/18, LFC once again spent big in 2018/19 [£175m]. Key acquisitions bolstered a core who by then knew Klopp's tactics inside out. They lost just once in PL, narrowly missed out on the title by a single point to City and won the UCL final.
With the desired team assembled, LFC only spent £4.5m in the summer before 2019/20. They hit the ground running and bossed the league, winning it comfortably. Klopp's arrival had marked a transformation at Anfield - patience and belief in his project yielded legitimate results.