#4 Use his backup midfield options
The Zinedine Zidane of last season was lauded for his skill at the rotation, but then again the Frenchman had the likes of James Rodriguez, Danilo and Alvaro Morata to call upon. This season, Achraf Hakimi and Borja Mayoral are Zidane's options as backup, so naturally, there is a reticence to rotate those positions.
What's rather baffling is Zidane's insistence on persisting with his admittedly excellent midfield combination of Casemiro, Luka Modric and Toni Kroos. Modric and Kroos in particular, have looked tired and off-the-pace of late.
Mateo Kovacic is injured, but Zidane would be really better off offering Dani Ceballos a chance to impress. The Spaniard already has won a game for Madrid this season, and has not seen a start since then. Ceballos would offer more energy in the middle of the park, and his freshness and eagerness to impress would result in Madrid being renewed in midfield.
Rotating Ceballos over the course of the season with Modric and Kroos would offer Los Blancos the chance to remain fresh when the business end of the season comes.