Desperate for a solution!! Please help

So, I’ve always had really thick hair. After I hit puberty, it got really dry and frizzy and difficult to manage. I get really frustrated with it sometimes because I can just let my hair down like the rest of my friends without it tripling in size.

I’ve tried everything. I only buy moisturizing shampoos and conditioners, I don’t wash every day. I deep condition with coconut oil once a month. I use a comb and a brush. I bought the “It’s a 10” keratin treatments. I get my hair trimmed often. I put leave in oils and conditioners in my hair.

Im 16 and have been waiting for my parents to let me get a permanent oil treatment or blowout or something to help me manage, but until then I need to find some way to make my hair calm down and something that I’m confident about rather than trying to hide in ponytails and buns and braids.

If anyone has any at home remedies, product suggestions, or new habits to try, I’m all ears. Thanks.

(I might post this in several groups, sorry if that’s annoying)