PRP, Forehead Reduction, or Hair Transplant? (photos)

I was wondering what would be a good solution to my hairline problem? My temples are thinning out. I used to part my hair on the left side since that's where my hair naturally parts. However, I've had to part it on my right side to give the left side a break from being parted, and to cover up my bald spot. The down side from that is that now my right side is starting to thin out! Also I can't wear my hair up for long periods of time since my temples feel all the weight of my hair short or long.