My suggestions

  1. Change to USB-C charging port
  2. Remove power button and make the little area where it lights up the on/off button
  3. Change the wrist mount so you don’t need a long-nose cable for charging. This should be as easy as making it larger.
    4.wrist mount needs a redesign if #2 is not done, it’s WAY too easy to destroy that pier button taking it out of the wrist mount