Você pode usar o ncdu para analisar o uso do seu disco. Da sua página inicial:
Ncdu is a disk usage analyzer with an ncurses interface. It is designed to find space hogs on a remote server where you don't have an entire graphical setup available, but it is a useful tool even on regular desktop systems. Ncdu aims to be fast, simple and easy to use, and should be able to run in any minimal POSIX-like environment with ncurses installed.
Está disponível no homebrew ( brew install ncdu
).
Tente
ncdu $HOME
ou
ncdu /