Do what I do and keep levels of both under the Upper Tolerable Limit.
It may not be as impactful as a possible megadose, but it shouldn’t hurt and should help for the issues, given enough time.
We take 1/4 of a B-12 tablet and about 500 mg total of active folate forms (have tried to stay away from folic acid sources for a while, but still occasionally take a half a standard multivitamin, which invariably has the folic acid form).