New YouTubeAdpocalypse. YouTube currently removing ads, deleting and terminating most channel with Kids content.
If you're in this niche always comply with YouTube community guidelines by checking it monthly.
What baffles me is it's refusal to tell you what actually you're doing wrong because the AI is currently making this decision which is not accurate.
If you have more subscriber you can contact them direct so that it get review by human.
My advise is to check your Video Thumbnails, Tittles, Tags and description making sure non is questionable eg (sexual content)
My last one is to change the comment section to manual approval so that you can delete those that does violate the YouTube community guidelines.

And Watch this video below to solve yours


https://www.youtube.com/watch?v=_4NgO69RprE&t=21s