@SouthernBee, congrats on beating cancer.
I recommend Phyto, a French brand which makes only plant-based products. Not sold everywhere but dermstore has it and some dept. stores and sometimes Amazon. It's an incredible line of products and I recommend the leave-in conditioner, especially when you don't blow dry. They have a line Phytocytane for thinning hair and it works well.
And for taming frizz and softening hair I recommend the Verb Ghost line of products. I do blow dry using a Cibu accelator. I put a brush to my hair as little as possible. Then when it's dry I spray the Ghost Oil, brush it through once and from them on use my only my hands to smooth my hair if possible.
I get my Verb at Sephora. It's also at Amazon and in some other places. I'm obsessed with the whole Verb line now because it leaves my hair so soft and manageable.