You’re different today than you were yesterday. Not very different, maybe, but things have certainly changed. Today is not the same as yesterday, and yesterday will never happen again.
Let’s assume that that’s literal - that you are literally a different person from who you were yesterday, but that you’ve dropped into your life with memories of all of that person’s accumulated experience, knowledge and wisdom.
If that were true, what would you do differently today? What would you keep the same?