Hair feels straw like 😕

So I don't know what the hell is wrong with my hair but lately it feels very straw like and not soft. It gets tangled very easily. I don't wash my hair everyday, only about 3 times a week, and I rarely use heat on my hair. My shampoo is sulfate free also. I only use a flat iron maybe once every couple of months. It's very frizzy and feels dry. I have a history with dying my hair, but I haven't done it in awhile. Does anyone know of any good leave in conditioners or serums? I tried this stuff by organix and its supposed to have coconut oil in it, but it honestly SUCKS.