I make a partial living with cross-platform, native desktop software (C++) ( e.g., https://www.phototangler.com ). That one is sold primarily to individuals, sales vary greatly month to month, and in general seems to slow down a bit each year. Beyond my own web site, I've managed to get that one on Steam and the Microsoft store, but neither of those move too many units.
My personal experience with selling other desktop apps over the years (many of which are now discontinued) has been that either people would pay for it (at all) or they wouldn't, after which it's mostly a matter of marketing to get more eyes on it. That is, I've had several other apps that didn't sell a single copy no matter how much traffic they received. And for the ones that do sell, doing targeted ad campaigns can definitely drive sales up, but in turn can be pretty expensive.
My personal experience with selling other desktop apps over the years (many of which are now discontinued) has been that either people would pay for it (at all) or they wouldn't, after which it's mostly a matter of marketing to get more eyes on it. That is, I've had several other apps that didn't sell a single copy no matter how much traffic they received. And for the ones that do sell, doing targeted ad campaigns can definitely drive sales up, but in turn can be pretty expensive.