Squeeze therapeutic putty 30s per hand, wrist curl underhand and overhand 10x3, rotate hammer from left to right 10x3. Nothing too fancy but it's the routine an occupational therapist gave me and it worked.

Is there a video/article you could share describing how to do these with good form?

I am now about 7 years into an RSI issue that nothing seems to work on, but I haven't committed to any training routine for more than a couple of weeks (with no effect).

Some starting points:

[The Functional Programmer - keeping Repetitive Strain Injury at bay](https://www.youtube.com/watch?v=q_eelK-KLIA)

[Wikihow](https://www.wikihow.com/Strengthen-Your-Wrists)

There might be, but wouldn't it make more sense to visit an OT and get personalized recommendations?

The BB Pascarelli and Quilter RSI book is worth reading.