Lacking breastmilk ?

Hi Mommies! I gave birth last December 2019 konti talaga yung milk ko but then my son's doctor advise me to take Natalac which was effective to me for the last 2 months and then my Auntie advise me to drink M2 (Malunggay Tea) thinking it will helps me to have more milk however parang kabaliktaran yung nangyari, mas umonti yung milk ko. I really don't know if it's because of the tea or maybe I did something wrong. Can you advise me on what to do to have more milk besides on taking those two ? Thank you.