B12 yes, get your # result

B6 yes, (will show elevated if you are on vits), typically only useful if reading shows very low---as that indicates neuropathy

D3 yes, get your # result

magnesium is only useful in very low and very high readings. Anything in between does not reflect your status much. Serum reading for magnesium is not accurate, but intracellular may be like from Acu-cell.

Sodium and potassium are in the general electrolyte screen.

zinc/copper ratio, can be useful too.

I believe there is a test for thiamine B1.

You could request heavy metals screen, for arsenic and lead.
Heavy metal toxicity can cause PN.

for prediabetes and hypoglycemia... HbA1C and fasting insulin can be revealing.