Reddit mentions of The High Performance Mind

I've been finding Steven Gurgevich's hypnosis sessions really helpful. I've noticed a significant increase in my level of calmness since I've been listening to them. I've got Heal Yourself with Medical Hypnosis (general purpose; not just for medical issues) and Relax Rx.

https://www.audible.com/pd/Heal-Yourself-with-Medical-Hypnosis-Audiobook/B002V0PYAI

https://www.audible.com/pd/Relax-Rx-Audiobook/B00B7M0QOU

Audible has several others and there are more on amazon in digital music. Even if the idea of hypnosis doesn't immediately appeal to you, maybe get a single session for 99¢, such as Progressive Relaxation, to see if you find it effective.

https://www.amazon.com/Progressive-Relaxation-Induction/dp/B01N5CYP0E

If you do decide to try this, I hope you find it as helpful as I do.

EDIT:

I also highly recommend Anna Wise's The High Performance Mind — an excellent set of guided meditations. And again, you can get single tracks for 99¢.

https://www.amazon.com/High-Performance-Mind-Anna-Wise/dp/B0026ETBO4