#4 Create a proper link between midfield and attack

Keeping the play central would require a proper link between the midfield and attack to avoid straying out wide. The midfield three discussed in the last point are not exactly the most creative players in Liverpool's squad. The departure of Philippe Coutinho and the injury to Alex Oxlade-Chamberlain have really sold the Reds short on creativity in midfield. Adam Lallana's return from injury could be a major boost, though.
The passing would be aided by the footballing awareness of Roberto Firmino. Not your typical centre-forward, Firmino usually drops back and bridges the gap between midfield and attack. This allows Mo Salah and Sadio Mane to make darting runs into promising positions. He perfectly integrates the midfield and the attack, and can outsmart Madrid's entire defence and midfield with his quick thinking and movements.
Firmino is probably Jurgen Klopp's most important player because of this. The movement across the front three would keep Real's defenders on their toes, all game. When the Reds press high up the pitch, they usually cause problems for the defenders. The link-up play and chemistry among the front three is an embodiment of the togetherness of the entire Liverpool squad, both on the pitch and off it.