Sydney Cocoaheads organized a pretty spectacular accessibility event for #GAAD22 with an amazing lineup of speakers. Please check it out for a great crash course on accessibility with some of the best!
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Tomorrow is @gbla11yday! And I'm going to start a challenge, tweeting everyday, for a whole year, about tips, resources, and other useful info on how to develop accessible iOS apps. Are you up for the challenge? #GAAD

Support both orientations, if possible. I know not even iOS itself does it, but it hasn't always been like that. You'll create a more robust UI that will be easier to port to iPadOS. And especially, don't force your users to rotate their devices.
Guidelines from Apple: Begin with a verb that explains the results of the action. Avoid using the imperative form of a verb because that can make it sound like a command. Don’t include the action type. Don’t include the control. https://developer.apple.com/documentation/objectivec/nsobject-swift.class/accessibilityhint