Shampoo recommendations for dandruff/itch prone hair? What am I doing wrong?

I have Very thick and dense 3b/c hair and no matter what I do my scalp is itching 2-3 days after wash day. I’ve gone from washing once a week to twice (whenever the itching starts) which helps somewhat but the only shampoo that really works is shelsun dandruff shampoo.. which is SO stripping and I hate how it smells. I don’t use a lot of product on my hair throughout the week, pretty much just a little bit of conditioner with water when I need some definition. Any tips? My hair also has barely grown past my shoulders in the past four years. I’m so concerned and confused