Do you know the birthdays of all the people who have wished you a happy birthday? Make it your mission to put a smile on their faces by wishing them a happy birthday too.
I have not been careful enough with this in the past.
Make a new page in your bullet journal. Write down each person's name and how they congratulated you: by phone, email, messenger or other ways. Write the birthday of each person in another column. At the end, mark the empty columns with a colour of your choice.
Is your list complete?
Have fun with it