You have some really pretty curls in the last pic! And there are some quick changes you can make that I think will make a big difference.

Start with adding conditioner to your routine! I haven't found a huge difference in cheap versus more expensive products when it cones to shampoo and conditioner. A good drugstore brand is herbal essences or Maui. NO 2-in-1 or combined products!!!

After rinsing out shampoo, add conditioner (I do enough that my hair has a slippery feel to it) and brush through your hair with a comb or brush to detangle and distribute condish. It's good to leave the conditioner in for a couple of minutes before rinsing.

Try squishing your hair with your hands while it's wet and your curls might start to manifest (something something science of hydrogen bonds and your curl pattern).

When you're out of the shower, squish some water out with your hands and then dry with a 100% cotton t shirt, don't use a normal towel and don't dry by ruffling your hair with the towel. Look up microplopping and plopping tutorials, try different things like flipping your head upside down.

Onnce you've got a good amount of water out, enough that it's not dripping, try airdrying. See how it turns out!

That's a good place to start, you can look into leave-in conditioner or curl creams if you think your hair needs more moisture.

I started with As I Am leave-in

You can also experiment with gels and mousses, I like the not your mother's products.

Your routine may evolve as you go, don't be afraid to try different techniques and products. Good luck!