4142 - To uplift your mood and energy, study Chassidus, often called the soul of Torah.

"Serve Hashem with joy, as the Zohar says. Being happy below brings additional happiness from above to the person. Additionally, add a Torah session, as the mitzvot of Hashem rejoice the physical heart." https://www.torahrecordings.com/rebbe/igroskodesh/012/005/4142