If you still have bills in fiat, it would depend on your margin, service businesses maybe you can skimp on the labour costs, but I don't see why you can't just price in processing fees and reduce fees by that amount so you get the same income you just not passing on your banking fees to the bank

Just raise prices for fiat. You'll just help inflation move along faster. You can also run it as a promo for first time customers only, if that makes sense for your business.

If you sell product with a gross margin of 15%, then you lose money giving more than maybe a 10% discount. If you are a freelancer, for example, you might still do fine giving a 40% or whatever discount if the client pays in bitcoin.

But not for every sale and forever, but as maybe a door opener.

Normal discount for bitcoin of 3% (around what fees exist for accepting credit / debit cards) or 5% even, might give customers incentive to pay in bitcoin.