What to do if experience guidelines incorrectly rejected?

My experience guidelines were incorrectly rejected. I say this because my game has no violence, no paid random items, and no trading system. There was no feedback available from the moderator, so I just retook the questionnaire (honestly) and got my all ages rating back.

Do I need to file any sort of appeal? Am I putting my account at risk if they for some reason again take down my age rating? How do I resolve this issue aside from following the questionnaire to restore my all ages rating?

No, but they might put your game up for review if it happens too much.