Do not waste time on things you cant do anything about today, focus on the things you can do and do them well.
Concentrate just on the things you can change, affect, or deal with today, do not waste time and energy on things you cant do anything about. Understand and accept that there are some things out of your control and to worry about them is a waste of your effort. Do the things you can do the best of your ability and be satisfied with how you handle these things.