Shampoo?

Alyn • 27 married 1 year together 9 1/2. TTC almost 5 years.😔 husband has low count and low T.
I have thick and wavy hair I just chopped off 10" to donate! My question however is when I use the same shampoo for a month or so my hair starts to become greasy when it's dried. I've gotten this from both blow dry and air drying. Anybody else had this before and have any suggestions?