The number one first step I recommend is a comprehensive consultation with a hair regrowth specialist who will perform lab tests to determine the underlying cause of your thinning. Without labs, no-one can really know what your true cause is and any treatment will be temporary at best.
I would ...
Female hair loss is different than male hair loss. Male hair loss reasons can be accurate however for the females there are tests that needs to be run. Vitamin, hormonal and anemia tests. Its better if you see a doctor