You could use Tretinoin (Retinol) and Trichoxidil (growth factors) together with Minoxidil (and might as well add Biotin in there)
Research has shown that retinol increases the rate of hair growth by prolonging the anagen (growth) phase of the hair growth cycle, playing a role in converting vellus (A.K.A baby hairs) to terminal hairs, and acts in conjunction with other hair growth solutions to produce denser hair regrowth (2).z
It's apparently highly effective with Minoxidil