I like & use a number of these ideas (I love the 5 Minute Journal, I have the app & the paper journal!).
Another thing we do, as a family, when we sit down for the family meal together is go around the table & say one thing each person is grateful for today. Two rules: you cannot be grateful for the family in the room nor the food in front of you, because that”s too easy. You have to dig a little deeper. 😋