My hair is thin as spiderweb but gets dry and ratty at the bottom and flat on top.
I already only condition the ends and shampoo the top, and I oil the ends when I leave the shower.
What do?
Same. Honestly, it's a slog of trial and error until you find the right products + styling techniques.
I had some bleach damage I had to deal with, so was using a bond shampoo (Goldwell) for a couple of months along with K18. Now that it's stronger, the bonding shampoo feels too heavy.
If you want more lift at the top, you wanna use a volume shampoo, which just means it's more clarifying than a regular one (don't trust a volume shampoo that doesn't have a
clear consistency). I'm assuming you double shampoo, yes? Incorporate actual deep clarifying shampoo too, I use this, smells very nice.
How often depends on how often you wash your hair in general + any extra products you use such as hairspray.
A blowout will of course make your hair look fabulous, but it takes some practice to achieve at home. A simpler method for top volume is using a root lifting spray, then blow drying upside down.
For dry ratty ends: commit to the chop. There's no saving nasty split ends, so go as high as you can stomach. Short but thick always looks better than long and stringy. If you meant ratty as in just looks sorta like straw from the mids down, then it's all about your conditioner and leave-in product right after washing (leave-in conditioner gives that sleek salon finish). Hair oil is meant for the end ends, like the last couple of inches. And of course it all depends on whether you have virgin, dyed or bleached hair.
My journey is not over, unfortunately. I used to have all blonde highlights and had a perfect combination of products. Now that I've cut most off and growing it out to have a more natural gradient, all the blonde products are useless. I fear by the time I find the right new combination, I'll start going gray and have to restart the search since grays tends to be more coarse.
Check out Abbey Yung and Blowout Professor. Not all their recommended products might be suitable, but they give good practical advice to find what's right for you.