To do no harm, one need look no farther than them self.
It is a point of view that may be hard to read in certain circumstances.
Therefore, put yourself first, do no harm to yourself.
For example, maintain your health with the basic routine of looking after your sleep, exercise, work, nutrition, education…
In this sense, you are better able to respond when change and challenges arise in your life.
In this sense, you are doing less harm to others.