Same problems here, friend, I use YesTo tea tree followed by L’Oréal Elvive protein recharge or Kerastase yellow tub conditioners. YesTo tea tree is through Amazon.
I use L’Oréal EverPure heat protectant and only blow dry, no flat iron.
My hair was falling out in clumps and super frizzy-fragile from COVID over the holidays plus some thyroid stuff going on. These products have made a huge difference. I’ve given up on biotin and switched to Omega3s, too, on a nutritionists suggestion. Good luck!