Best hair products for straight/wavy hair?

I’m having the hardest time finding products that work for my hair. I wash my hair every 2-4 days. Somehow it always looks dry and frizzy but my roots are flat and with this new shampoo I’ve been using a couple months, I think it strips my oils too much because my roots have gotten super greasy super quick and it makes my hair literally squeak when I use it. The conditioner doesn’t do literally anything for me. I need something that’s moisturizing but doesn’t make my hair greasy and keeps the waves in my hair. Also good leave in conditioners or detangling spray! Pic of my hair for reference (this was taken after it was washed and blow dried)