Your regimen:
I don't know what "regaine" is but you already have the big two:
finasteride and minoxidil
You also use MSM which I believe helps a TONNNNNNNNNN with thickness. I don't know why, but since adding it to my regimen, my hair is thicker allover and growing faster.
Hair Coloring. I believe that this helps most obviously by giving color to every hair. The dye infused in to the hair shafts helps add thickness. I also believe the PG and other stuff in the dye solution acts as a scalp peel. My scalp always looks like baby skin ofter dying or lightening my hair.
I think more of us need to experiment with hair coloring and see if it helps.