The number 1 can work like this:
The #1 Mindset Change …
The #1 Risk …
The #1 Reason Why …
Your second headline is my favorite because it paints a clear picture and is more specific. Perhaps you can mix it a little with your other headlines:
How This Simple Mindset Can Instantly Overcome Anger at the Heat of the Moment
Or: How to Instantly Diffuse Your Anger at the Heat of the Moment
Enchant readers. Woo customers. Win business.