Seeking advice regarding hair loss

‌I am in my mid-50s.
My hair is getting thinner, and it seems to be progressing in an M-shape. The volume has decreased significantly.
Now that it has become a real issue, I am very concerned about it.
I used to style my hair upwards, but now that is becoming difficult.
I searched online and found there are oral medications (prescription) and topical medications (available at pharmacies without a prescription).
ChatGPT mentions side effects like sexual dysfunction. Even though I don't think I'll have issues, it still worries me.
Even my older brother told me today that my hair volume has decreased a lot.
I plan to visit a clinic this month, but should I go to a dermatologist??? Or should I go to my regular doctor and ask for a hair loss medication prescription?
How should I search for a dermatology clinic that specializes in hair loss?
Are there any good products out there?
I would appreciate any advice. ㅜㅜ Thank you in advance.
Have a wonderful holiday.