All productivity tips typically focus on optimizing your ability to get things done. However, this is only important if the things on your list are important. Otherwise, you are merely trying to keep busy.
Ensure that you are constantly building in activities that move you toward the fulfillment of a 'big' goal - something that moves you, inspires you, drives you, fulfills you. Without this you will likely always struggle to stay 'productive', simply because you have no interest in working on what you're working on!