When I truly need mojo...I put on the Rocky 4 soundtrack. According to a highly unscientific poll I conducted (with friends and acquaintances born in the 70s), this Cold War Rocky made a strong impression on many people who continue even to the present day to dip into "Hearts on Fire" or "Burning Heart" as needed.
Listening to Eye of the Tiger -- which was originally released in Rocky 3 and then "recycled" in Rocky 4, Wikipedia notes -- doesn't only make fans like me recall a heated Man vs Machine showdown, or an unparalleled training montage (and yes, you should watch all 7 minutes of this video):
It also harkens back to the story of a young and poor Sylvester Stallone trying to sell his script. A born underdog with a paralyzed face, Stallone managed to sell the script and himself to the studio.
I use the young Stallone chutzpah as a lever to help myself out of rejections and failures. I slap an abbreviated Rocky 4 onto Spotify -- there really are only 5 songs worth listening to -- and imagine myself running through the snows of Siberia. Yeah, I can face the job search again. If Rocky can chop massive firewood with a beard, I can do this.
Feel free to use Rocky as needed, or think back to a story that pushes you back into mojo. Preferably it includes music too. Then watch your fortunes turn around.