How to train hair..?

Michele
Good morning! I am currently looking for some advice on how to train my hair to being washed like 2 or 3 times a week. I wash my hair daily. I know it's bad... I do have Hypothyroidism and usually if I don't wash my hair once a day it gets very oily and itchy. I know washing your hair daily can actually damage your hair. No I don't have lice.. Can anyone suggest any advice on this? Thx you.