Ferratin at 6, hemoglobin 10.5. Korean doctor says it's OK . I'm an endurance athlete, help!

I've had low ferratin, and iron deficient anemia since my 30's. I recently moved to Korea and my hemotologist says it is fine since I'm barely anemic. I'm competing in a race(hyrox) in November. What can I do? Tried asking for a second opinion but the other hemotologist doesn't see western patients.

Any one know of an online provider I can use? I'll pay out of pocket. I'm also looking for any advice on increasing it.

Currently taking iron supplements and eating at least 120 grams of protein a day.