For the "thin" part of it I take Biotin, also for splitting nails...
For a very high hair-line... our local women have a lot of that, so they put a weave in it, or some sort of African braid with beads and hey it looks just fine. Even with hairlines half-way up their skull.
Some European women do this also I've seen - cool.
Depends on your style and if you can wear such.
Just a thought,
Axélle