Keep a diary or journal. Be it digital or offline notebook. The reason diary should be kept is that you can use it to document your daily routine. When you write things that worked and things that don't. It helps you understand where to put in most effort. This is helpful for memory and also helpful for you to move on from things that bug you. Writing a diary and letting your thoughts out and setting a direction for next day is good. Hope your Sunday was good. I hope to see you in few hours in nice positive Monday!