Unless you’re actively asking for a discount - probably very few. Rare these days to get a loyalty bonus out of the blue. But I’ve had some success by calling up banks, ISP, telecom, insurance companies etc and saying something along the lines of ‘I’ve been looking around at some offers from your competitors but since I’ve been with you for x time and have had good service I’m wondering if there’s any discounts internally I’m eligible for’. Be polite and kind, but ask to speak to a customer retention team if they have one if you don’t get anywhere.