Frizz

Hey all! So, the top layer of my hair is always frizzy. I assume it is damage, but I don't do that much to my hair. I'm 39, I use natural shampoo bars, and natural conditioner, and I wash my hair 1-2 times a week. I try to stay away from silicones. Last time I used dye was maybe 4 years ago. No bleach; occasional sun in during the summer when at the lake. I used heat accessories maybe once a week.

Is there any recommendations to smooth the top layer? It tends to run curls when it is fizzy. Thank you in advance!