How to improve ergonomics so I can stop having this pain in my wrist?

Lots of advice. Here's a Govt link from OSHA but there are many online - just search using words: ergonomics and wrist. Also, a visit to an office supply store or website. It can be trial and error to find the best for you! But if you have patience, you can. If it's at work - your boss may pay for it.