The easy way to become productive is to answer two questions:
Who am I?
What can I do?
Once you answer, Who am I? Then what you can do, or are meant to do—even for the short term—can be discovered.
When you know who you are and, what you are going to do, saying "no" to anything [or anyone] that does not help you complete your goals, plans or vision, is simpler. This is how you become productive.
Remember, this exercise is simple, not easy. Addressing these questions will be painful and may even cause sorrow, because every time you say "yes" to anything [or anyone], you are saying "no" to a hundred other options [and individuals]
But, you have to, if you wish to be productive.