Tips for curly hair mullets (22 M)

Heyo! as i have grown out my hair I have noticed that is pretty curly, maybe like a 2b/c. I live in a very dry/cold climate which makes my hair really dry, matted, frizzy, and all out not great. My hair is also reallllllllllllly thick/heavy, making it sit weird on my head and neck sometimes. My hair care is pretty limited. I use shampoo like 3 times a week, but conditioner everyday (I was told this is a horrible idea). For styling I use mousse and only brush when it is wet. Is there any tips that you guys can recommend? I was thinking of throwing some argan oil into the routine.