The most important thing is probably to use native UI controls, either AppKit or SwiftUI, rather than Qt or other frameworks, even those that espouse the use of native controls. That will get you a lot of things for free, generally.

Don't install invasive "helpers" or login items in weird locations; don't ask for huge amounts of system permissions without an appropriate introductory flow for your application, explaining what it needs to do before trying to install or get permission for something.

Bundle your dependencies appropriately; don't go fetch weird stuff post-install, the application should be designed so that everything is already there in the bundle.

Put application data in the idiomatic locations; ~/Library/Application Support, ~/Library/Preferences, etc.

Carefully consider what keyboard shortcuts your application uses; if you use the Escape key for something, or modifier keys, make sure it does something that makes sense on the platform and doesn't conflict with other shortcuts.

Don't bundle Chromium.

Generally: Respect the user as much as possible. Things should "just work." If there's a situation where it doesn't or something feels "odd", you should do whatever you reasonably can to fix that.