Perhaps, what is of great importance in this respect is to explain why self care matters. Well, the most obvious reason is that you will be psychologically stable.
The thing is that we all forget to take proper care of our ourselves trying to achieve more and more in this life which quite often looks like a race. No one really knows what defines a successful person, yet everyone wants to be them. That is the reason why so many people are doing something even though they do not always know why they are doing that.
What is necessary to do is to figure out what is worrying or bothering you as well as come up with possible solutions. This is the first step you need to do in order to take better care of yourself. There are lots of other things that one needs to do. One of them is to worry less and to do more. You should not concentrate on something that does not depend on you. The best thing you can do is simply to move on.