Welcome @roslyn, I try to strengthen the muscles in my legs by different exercises along with riding my recumbant cross-trainer for 30 to 45 minutes 4 or 5 days a week. I think it helps me maintain some of my leg strength. Here are a couple of different articles that may be helpful:

-- How to Restore Strength to a Nerve Damaged Leg: https://www.livestrong.com/article/520445-how-to-restore-strength-to-a-nerve-damaged-leg/
-- Exercise + Physical Therapy For Neuropathy: https://www.foundationforpn.org/living-well/lifestyle/exercise-and-physical-therapy/

Have you tried doing different exercises to build your leg strength?

Rent out a stationary bike