Here’s three studies. By my reading, none of them exclude the idea that exercise could increase nerve damage. They do suggest that exercise can improve nerve function, increase nerve healing, and/or reduce the perception of pain. They use both experimental studies in animals, and observational studies in humans (hard to do a double-blind study in people). They note that there are many causes of PN, so YMMV.

Neuroprotective Effects of Exercise Treatments After Injury: The Dual Role of Neurotrophic Factors
Emerging Relationships between Exercise, Sensory Nerves, and Neuropathic Pain
Benefits of exercise intervention in reducing neuropathic pain

My PN pushed me to take swimming lessons and swimming can help me out, when I get to the pool. Hoping you find something that works for you.