I have naturally wavy/curly hair that is prone to major dryness. I use a round brush when drying in order to smooth it out and wear it straight. I feel like my hair gets used to shampoo/conditioners/serums after using for a couple months and stops looking shiny/smooth. Any recommendations? Most recently I've used Redken's All Soft line. I prefer to spend under $40 total (but typically I try out travel sizes first just to see what I think).