Those are pretty much the “other elements.” Apart from essays, don’t forget to pay attention to the EC descriptions and other parts of the app. Make the most of every bit of word count that you get. If you are applying to UCs, make sure to allow enough time in your schedule to write great PIQs and great EC descriptions (you get more word count for these in the UC app). Also, give your recommenders a proper brag sheet with everything they need to know to write a strong letter.
P.S. Make time to enjoy your senior year, too 