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Thrasher
First of I just want to say that it’s good you had it checked.
But B12 does not come from healthy and varied eating.
B12 comes from bacteria. Because there is lots of bacteria in our soil and in our guts you can either eat dirt or feces (the bacteria that produces B12 unfortunately lives past the point in our gut where we absorb it, so it has to exit before re-entering) OR just take a supplement. You either need 500mcg a day or 2500mcg once a week.
Given you are low I’d take 500mcg twice a day for a month to boost your intake.
It’s water soluble so you can’t overdose on it.
Personally I think it’s part of being a responsible vegan. You need to have B12 under control to silence the sceptics.
You should also add 2000 units (50mcg) of Vitamin D to that, but you didn’t ask specifically for that so I won’t go into depth. It’s just a recommendation.