Okay ladies, I am in some serious need of help for my hair. Over the past few years it has gotten more brittle, falls out, and breaks off. I only wear my hair down. I wash it 3-4 times a week just depending on activity and all. I use Tresseme for shampoo and conditioner. I blow dry it 1-2 times a week, and straighten 1-3 times a week. I haven't dyed my hair in at least 2 years. I used to have super healthy, long, and thick hair. I want my beautiful hair back 😭😭. I think I need to get good heat protector as well. Should I change shampoo/conditioner?

Please help!?