Try: Telling Yourself a Pump-Up Story (with Soundtrack)
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.
(The backstory is up for debate. This 1979 New York Times profile tells one story. Snopes suggests there's another.)
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.