I am pretty thin on top, thin enough to get a sunburn if I don't wear a hat. My rate of hair loss slowed down a lot after I started HRT. It is probably down to a replacement level, so I am not seeing any further thinning. However, in spite of my best wishful thinking, I don't see any evidence of regrowth.
I doubt if I have enough left to transplant for a new hairline. On the other hand, I like being able to change hairstyles and colours just by changing wigs.