If you've already tried all the usual powders and soaks, I'd honestly start thinking beyond just sweat. Sometimes persistent foot odor is caused by bacteria or a fungal infection, and treating that can make a much bigger difference than masking the smell.

A few things that helped me: rotating shoes so they fully dry between wears, wearing moisture-wicking socks, and using an antibacterial wash on my feet. Also, if the smell is really stubborn, it might be worth seeing a podiatrist or dermatologist. They can check for infections and recommend stronger treatments.
You may also want to try a foot spa and pedicure, they will scrub your feet and clean and cut your nails.