Maybe try a leave in conditioner, here are a couple of Ideas I hope they help
my daughter has fine hair that tangles all the time. I use white vinegar. I just fill a spray bottle with half water and half vinegar. And vinegar smell disappears.
Wet Brush. (Sorry on my phone so I can't attach product link) My daughter has hair down to her knees and she would get terrible tangles. This has saved us!!!!