frizzy help with pics

i think my hair is 3a
its really thick and course so its hard to keep under control and im trying to grow it .i have it thinned a little every few month to reduce the bulk.
its wavy at the roots and then curly , and i have problems with it being frizzy and dry when i shampoo , so it look's flat on top and then terribley frizzy and bulky at the ends, like a trianglar shape.

what can i do to condition/ reduce the bulk and size but
also add more overall curl and defintion at the roots
any products i can get in england?

even shampoos designed to reduce frizzy and dry hair just make it frizzy