Can you change the angle at which you hold the guitar, so you're not stressing your wrist? Make it higher or lower? Also, is this a classical or a steel-string guitar? I'm guessing steel string.
There are grip exercisers you can get at music stores that are good for strengthening both fingers and grip. They have fingertip pads to push on and steel springs inside them, and depending on how you hold one of them it can work on the thumb, the hand itself or the wrist.
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There are grip exercisers you can get at music stores that are good for strengthening both fingers and grip. They have fingertip pads to push on and steel springs inside them, and depending on how you hold one of them it can work on the thumb, the hand itself or the wrist.