If you use SwiftLint in your SwiftUI project, there is a rule, by @rerycole34, for making sure that your images have either an accessibility label or are hidden for assistive tech because they might be decorative.
Rule: https://realm.github.io/SwiftLint/accessibilitylabelforimage.html
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Sometimes, buttons change meaning, for example when toggled. An example is a play button, tap it and it becomes a pause button. In such case, updating its accessibility label will be clearer than trying to convey the change with traits or values.

If you are using SwiftUI to build your apps, there is a fairly basic but very useful Accessibility Inspector built right there in the Inspectors Panel, on the right side of Xcode.
Check isReduceTransparencyEnabled to lower transparency. A great example is Spotlight. Not only transparency is removed but it keeps the main color of the background, it feels personalized and contextual but reduces noise and improves contrast.