Bro your hairline isnt even that bad not that much recession not everyone has a perfectly straight hairline, thats mostly an african American trait, but if you wanna feel comfortable just use finasteride.
Not washing your hair will just make it greasy and will most likely do more bad than good.
Nobody has ever regrown an hairline by not washing hair, its just Impossible because Androgenetic Alopecia is not related to how much you wash or not your hair