My sister makes one that has been the most powerful for her and her teenage daughter who both sweat buckets. This is the recipe, but I don’t think she uses corn starch, it’s almost impossible to find in the UK, unless online. I think she uses corn flour. https://thehomemadeexperiment.com/homemade-deodorant-powder/
You can put it any where and it smells lovely.
I also wanted to ask what kind of smell is it? Is it sweet or dark, musky? Some medicines, diabetes and other things can effect the smell. Have you checked if anyone else can smell it? Just wanted to make sure it wasn’t a self confidence trick of the mind etc.