Questions about hair loss treatment reviews

Hello!! My hair has always been on the thinner side, but recently the hair density on the crown of my head has been... thinning out so much that I am seriously considering hair loss treatments. It’s a total shock every time I part my hair. I looked up reviews, and it seems like a lot of people say I need to start managing it before it's too late. There are so many different types of treatments, but now that I’m actually thinking about it, I’m getting really worried. I've heard that once you start a treatment, you have to keep doing it... So, I’m curious about reviews from people who have actually received these treatments! For those who have had treatments, how much fuller does it look? I know it might feel different for everyone, but I’m wondering if I have to keep getting it for the rest of my life. Please share your experiences!