I have managed RSI for decades, so consider this anecdotal of course.

The one thing that has always given me relief: changing my keyboard every 6 months or so.

For this reason I have a stack of different keyboards and whenever I start to feel the tugging pain gnawing in my hands muscles and tendons, I switch out the ol’ keyboard and get back to work.

Within a day, relief.

Seriously, it’s that simple. Just don’t get fixated on a single keyboard and you’ll be fine. Get yourself a small collection, swap them around.