On hard days we stand so close to ourselves that we can't see anything at all. Writing in the third person takes you one step back, and one step is enough: the same words you would say to a tired friend become sayable to yourself.
Write the day as if it were the day of a friend you love. What has this person been carrying since the morning? Where did they get tired? What did they do anyway? Then write what you would say to them if they were sitting in front of you now. Don't flatter them - but don't be hard on them either. Say the truth the way someone who loves them would say it.