Don't use a B12 level as a sign of whether the treatment of a B12 deficiency is adequate. You need a treatment frequency and volume that is adequate to alleviate symptoms. Symptoms may increase in early stage treatment especially with a severe deficiency or neurological damage.
From personal experience, I know it is possible to have deficiency symptoms with a serum B12 result that is within range.
You might want to look into Functional B12 deficiency, where there is plenty of B12 in the blood but it's not getting to where it's needed in the cells.
MMA, homocysteine and Active B12 (holotranscobalamin) tests may help to diagnose functional B12 deficiency.
If your diet is rich in foods that contain B12, have you thought about whether there could be an issue with absorbing B12 in the gut.
PA (Pernicious Anaemia) is an auto-immune condition that can lead to B12 deficiency.
Coeliac (celiac) disease is another auto-immune condition that can lead to B12 deficiency.
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