Pick a director, watch a lot of their movies

Some suggestions:
Joan Micklin Silver
Robert Altman
Agnes Varda (pictured)
Jacques Demmy
Earnst Lubitch
Spike Lee
Abbas Kiarostami
Federico Fellini
Charlie Chaplin
Francois Truffaut
Yasujirō Ozu

And a reminder that you can watch a movie over multiple nights because movies are long and sleep is important.