What you do today is important because you are exchanging a day of your life for it.
Probably never thought of it that way, but how are you investing your time? Ask God for guidance on how to best serve Him and make the best of such a huge responsibility. What's the most important thing you can do today?
It is to be with him, and he is to read it all the days of his life so that he may learn to revere the Lord his God and follow carefully all the words of this law and these decrees