Dandruff? ☹️😷

Hi guys. I need some help. I've had dandruff since I was young and I know it sounds gross but it's really been annoying me. I can't go one day with out washing my scalp or it'll itch and be uncomfortable. I don't like washing my hair daily because I spend a ton of money on highlights and all the dandruff shampoos I've used have only helped temporarily and washed out my blonde color ☹️ please give some tips if you have any?!