I fell for some FB marketing and it's been worth it.
I started using the LUS brand of shampoo/conditioner/styler. They have both a wavy and a curly line. There's been a learning curve, but I have more defined curls than I've ever had in my life. I have way less frizz than I've ever had. I do need a haircut, so I've got some weigh down on the top, but I'm seriously impressed and am going to keep using it. They have loads of videos for both wavy and curly hair to try and help you learn to use it. They also seem to have some amazing customer service. If you're having issues using their products, they ask you to send a photo of your air dried curls after shampoo/condition and then a photo of your curls with their styling products. Loads of rave reviews about their customer service. I was about to message them, but they posted a new video of a wavy hair person who sounded like my hair and I used their method and it is working much better.
Oh and their spray bottle is awesome. You just pump it one time and it constantly sprays a fine mist for maybe 5 seconds and wets my hair back down.
ETA: They actually have wavy, curly, and kinky coil. They follow the normal curl types. IIRC, I'm 2C, though with the right product I can look like a 3A.
I hope this resizes in the post.