Custom actions work as great on Switch Control as they do in VoiceOver. It makes navigation much, much, faster and you’ll be able to find all those custom actions in the Switch Control menu.

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Test manually. Familiarise yourself with different assistive technologies. I find it useful to start with VoiceOver but check out Voice Control, Full Keyboard Access, and others... Remove friction, configuring shortcuts can help. Merry Christmas!
Do you know when a UI element is greyed out to show that it is disabled? Yes, there is an accessibility trait for that too: .notEnabled. VoiceOver will say “dimmed” after its accessibility label and Voice Control and Switch Control will skip it.

Toggles or UISwitches are often found separated from the label that precedes (and describes) them; with an unclear label; missing a value, trait, or hint; or even not being actionable at all.