I think I have addressed this elsewhere, but it is very likely that Alkymst's B12 level was much lower than the 400 result. False results are very common, and your increase has probably been much more than 400 to 700+ suggests.

It also is almost 100% likelihood that malabsorption is severe. And in addition to that, transportation of B12 is likely not very efficient.

The bottom line is that if it were me, I would take more each day. I believe it is very likely that more B12 and more time will get that level up higher.

It is also possible that your body is functioning more efficiently (including thyroid, which often is affected when the body is damaged by something else). That or other good effects may be partly or entirely due to improvement in function.

rose