best hair mask?

Arianna • With the love of my life and mother to our handsome little boy ❤️
So my hair is naturally straight/a little wavy, and dark dark brown(almost black). I have dyed my hair lots of times and last year I went blonde, which included bleaching it many many times. My hair would snap off, and I lost a LOT of it. I decided to give up on the blonde because I kept getting chemical burns so I dyed my hair dark brown so I can just grow it out and let it be natural. I trim my hair every 6-8 weeks, and do the chemistry shot treatments once a month. My hair is now a little below my shoulder length but the ends are extremely dry and super frizzy. I use leave in conditioners and oils daily. I switch shampoos and conditioners every two months so I can try and find something that works but nothing so far. I've used redken, matrix, design line, Pantene, dove, Maui. Do you guys have any suggestions on how to get my hair back to feeling and looking healthy? I really want to try some hair masks. I've tried a few with no results. I also never brush my hair while wet and avoid any heat to it.