Writing - Having a journal or a book with just your thoughts can keep your mind at ease, I never knew how much this would help me until I decided to journal for a week and it helps so so much. It helped me find some calmness knowing I could explain my unflitered emotions without a single ounce of worry or judgement because I am putting it down on paper. If you do not have time to do this or simply dislike writing I reccomend recording yourself talking about your day, just let it all out, then listen to it back if you want, and then delete it. You can save it but I personally delete it to have clear mind and phone.