Next time you’re at your favorite coffee shop, or any other place where you tend to buy yourself a treat, go ahead and pay for the person after you. If you do interact with them, ask them to “pay it forward” if they can, paying for the next person after them. Hopefully, you can start a chain of people passing along the goodwill.

https://www.theactivetimes.com/healthy-living/how-to-show-gratitude