Question: What if my ferritin is low, but other iron markers are normal?
I would first see whether getting more iron in your diet raises your transparent saturation or your iron saturation higher than 40%. If it does, then I wouldn't push it but if it doesn't or if your transparent saturation is significantly below 30%, then I think there's room to try to increase iron further.
If pushing iron up isn't the answer, I would try something like milk thistle or sulforaphane, things that are designed to promote gene expression for detoxification are antioxidant defense such as milk thistle and sulforaphane are generally also going to raise ferritin because ferritin is part of the protective response.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.