Hey I saw your comment about why you didn't want to use minoxidil, based on the idea that the hair follicles become dependent on it. I just wanted to explain where this notion came from and why it is false. People often say Minoxidil hairs fall out when you stop, but this is only half of the truth. As you pointed out, minoxidil helps with bloodflow, but if the local scalp conditions (fibrosis, etc) are not taken care of, then the hairs will just fall out as their blood supply becomes choke and cannot be sustained without Minoxidil.
If you've ever been on the Minoxidil Beard forums, people frequently use Minoxidil to mature white micro vellus hairs in their beard to become full dark hairs, to fill in their patchy beards, and when they stop Minoxidil, those hairs never fall out. This is because that skin is able to sustain the hairs without the minoxidil. I can speak from experience here because at 22 years old, my beard had not changed at all from since when I was 16. When I did 2 cycles of Minoxidil on it, 4 months each cycle, my beard filled significantly. 3 years later, I still have all that growth, and not only that, the minoxidil thickened up other areas of my beard and made the hairs thicker in general, and so far, this has not reversed at all since stopping. The areas of my beard that minoxidil filled in are still actively growing 3 years later.
So I strongly stand by the notion that there is nothing about Minoxidil that inherently makes hairs become dependent on it. It's just that when Minoxidil grows hairs in areas of the scalp with significant fibrosis/calcification or whatever, those hairs cannot be sustained with Minoxidil if the local fibrosis issue is not taken care of.
We have transparent vellus hairs all over our body and minoxidil can mature these into full-dark hairs, and these hairs do not fall out or become small again! Considering that you have a lot of vellus hairs on your hairline regrown from microneedling, I strongly believe that a short-run of Minoxidil would help accelerate the development of those hairs into mature hairs, without making them become dependent on it.
Just note - if Minoxidil does regrow hairs in areas where the calcification and such is not fully taken care of, the scalp will not be able to sustain those on its own prior to stopping... however, considering you've been needling for a while, Minoxidil may be exactly what you need. It's a major growth stimulant for hair, and as long as the scalp conditions are taken care of, those hairs will be kept.
In any case, keep up the good work!