When to do hairline transplant for people with a lot of fine hair

I took biotin supplements and my hair grew almost to this level.
It feels like the hair is sparse, almost up to the desired line.
In this case, would it be better to use minocidil?
(Making fine hair thicker??)

Or... just do a hair transplant on the empty part without minocidil.
Is it better to take only biotin supplements??

And when planting, avoid areas with fine hair follicles.
Are you planting it???
For some reason... after taking biotin, it feels like fine hairs have appeared in areas where there weren't any originally... I guess it's because fine hairs have appeared in areas where hair follicles were originally?? ㅜㅜ.
I'm looking at the effects of nutritional supplements...
I don't know how to do the transplant.
It feels like a photo..