Hey there, the best resource is our ad-friendly guidelines – we recently added more detail and examples to provide more insight: https://yt.be/help/FzTu Also, it would be helpful if you can share more details on what’s happening when you try to appeal. Keep us posted.
Although we can't give you specifics on how you should create your videos, we recommend that you review your videos and use the questionnaire & guidelines we provided to self-rate your content.