How to lace shoes for proper fit

Wow guest, you're reporting from a different end of the spectrum. Normally it's something like *insert sexist, racist, or otherwise offensive thing*, but this guest is in the social justice nazi category. I, who also have flatfoot, would also like to know such things. But I seriously doubt that lacing your shoes in a certain way would help your arches. Get a shoe with better arch support or some inserts with arch support.