Prevention of hair loss symptoms

When I was young, having a lot of hair was actually a source of stress, but as I got older, I think it was a blessing. Now, I am losing a lot of hair, and my hair volume has decreased significantly, but I still hear that I have a lot of hair. However, I am worried because the top of my head looks quite sparse. I have been using anti-hair loss shampoo and taking supplements, but I haven't seen much effect.ㅠ