Okay, so this is an app recommendation and a book recommendation in one. Basically if you need more gratitude in your life, this is easiest way I have found to get it. It literally takes only 5mins or less each day, so why not try it. I have found the book to be best, but the app is great if you are travelling, or need to do the journal whilst on the go.
Pic below is from the five minute journal website, but gives a good overview of what it is all about: