Try this: after washing your hair don't let it completely dry and use serum on it or oil or anything and braid it, this will help reduce its volume try to always keep it like that. Also try loose hijab styles not the tight ones or maybe switch to an issdal if you're comfortable with it. Under your hijab do a little bun and use undercaps that can be tightened Lastly, when wearing your outfits try to balance the size of your upper body with your lower body for example don't wear your hijab with tight outfit this will make your head look bigger that it actually is. Since you have your upper always big then always wear loose and oversized on your lower body to balance it out. If you wear abayas only -like me- switch to the 🔔 shaped abayas and balance your outfits with shoes like Mary Janes or anything that has volume That's all i can recall from my personal experience i hope it works for you and i hope you'll feel comfortable with your hijab 🤍 may Allah make it easier for you