Try holding it over steam, and shape it whilst damp (being careful not to get the sweat damp) - this may revitalise the shellac. If not you can buy stiftener, but remember Borsalino's are reknowned for being soft hats.
Get a steam iron & a white handkerchief. Iron with a good bit of steam with handkerchief between felt & iron.
The steam with "reactivate" the shellac & the pressing will firm up the felt some.
When cooled, the brim should be firmer.
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