When it comes to hair loss management, are the condition and shape of the hair loss more important than the amount falling out?

I feel like my hair has gotten thinner than before, so I am wondering if I should start hair loss management.
It’s not like I’m losing a lot of hair noticeably, but I’ve heard from people around me that it’s good to manage it early, so it’s bothering me.

Now that I'm actually trying to look into it, there are so many different methods, such as hair loss medication, supplements, and scalp care, that it is difficult to know where to start.
I'm also wondering whether it would be better to get tested first or try changing my lifestyle habits first.

For those who are just starting hair loss management, I would like to hear about the experiences of what prompted you to visit a clinic and what management method you initially chose.