Welcome @alg56, I'm glad to hear that you are seeing some improvement in the neuropathy taking liquid vitamin B12 with Folic Acid. The Foundation for Peripheral Neuropathy has a list of supplements that are known to be helpful for neuropathy here - https://www.foundationforpn.org/wp-content/uploads/2020/08/Complementary-and-Alternative-Treatments-Revised-2020-final.-1.pdf.

Have you talked with your doctor or surgeon about the new neuropathy symptoms to see if they may have some suggestions?