Dermaroller and essential oils to grow hair on temples?

Hi Everyone this is my first post here and Im just looking for some advice. I'm growing my hair out long to be an extra for a tv show but I've noticed that it doesn't really suit me as much as it does other guys. The reason being is because of my hair line, Im not losing my hair or anything like that but I truly believe for a guy to pull off long hair it really helps to have a good hair line.

My hair line is kind of matured around the temples and recedes back a bit more than I'd like (pictured). I've been using a dermaroller coupled with essential oils (lavender, jojoba, coconut) for I think the past 3 months and I have noticed that I do have baby hairs that are growing from the hairline out but I was just wondering if anyone else here has completely regrown their hair on the temples using this method or what method should I use?. I've researched that onion juice is apparently great for growing hair. When I rub my temple areas it does feel kind of furry, I think that could be the vellus hair although they are really short, it kind of feels like peach fuzz. Any help is much appreciated, thanks so much

https://i.servimg.com/u/f11/17/45/87/61/img_2010.jpg