(1) Ensuring your chair, desk, and keyboard are set up so your wrists are straight when typing
(2) Using a split/tilted keyboard so your wrists do not need to rotate as much when you type
(3) Using a vertical mouse so your wrist does not need to rotate as much when mousing
You can accomplish all of this for very cheap. A bit more than you're spending, but not an order of magnitude more (unless your desk or chair are very bad). Once you get into mechanical keyswitches or exotic keyboard layouts you're just messing around imo. Membrane keyboards are fine. They're fine! And very quiet.