Even though I'm not Buddhist, I always return to the Ganges Mahamudra when I feel down.
"Mists rise from the earth and vanish into space.
They go nowhere, nor do they stay.
Likewise, though thoughts arise,
Whenever you see your mind, the clouds of thinking clear."
...
"The most majestic of outlooks is free of all reference.
The most majestic of practices is vast and deep without limit.
The most majestic of behaviors is open-minded and impartial.
The most majestic of fruitions is natural being, free of concern."
https://unfetteredmind.org/practice/pith-instructions-on-mahamudra/