Which treatment for hair loss is the most effective?

Lately, every time I look in the mirror, the crown of my head and my part look so thin that it's driving me crazy.

I feel like topical medications have their limits, so I'm thinking of getting medical treatment.

What is the most famous treatment for hair loss?

I want to try managing it first with injections or lasers before going as far as a hair transplant.

If anyone has personally received a good hair loss treatment and seen their hair become thick again, please share the details!