Hair oils for bald patches?

Well not exactly bald but the hair density near my forehead hairline is less compared to other areas that I don't feel confident putting up ponytails.

I think it's cuz I used to straighten out my bangs before a lot but I have stopped heat straightening for like 5 months now. But i do see baby hairs near my hair line. Yet this one spot looks off.

Suggest me some hair oils that would help. Rosemary? I heard someone say kanjoli oil helps with bald patches.

Also i have bad oily scalp and dandruff so I can only use oil right before hair wash as my doc suggested not to use oils constantly.