If someone with autism is more likely to suffer from depression and anxiety, what can be done?

Unconnected: It is not clear that people with autism are more likely to have depression or anxiety. It may be harder to diagnose, because they may not be able to express their feelings; but, if they have either, they should respond to conventional treatments about the same as someone without autism. Even talk therapies can work, but that requires expertise with autism.

Mental health care: Careful monitoring of the person's mood and emotional adjustment. If questions of depression or excessive anxiety arise, there should be a consultation with a psychologist or psychiatrist.