Oh, the classic sudden-death scenario. TikTok's flagged you, not banned you. Happens all the time when the algorithm sniffs something off.
Things that trip this nonsense on fresh accounts: dropping a link too early, using copyrighted audio on a business profile, re-uploading compressed clips from other platforms, posting like a bot after you get a few hundred views, or using hashtags that trigger moderation filters. TikTok's review system is hypersensitive.
Your first posts getting 300-500 is actually decent. Dead accounts never see distribution at all. So you're not screwed-just temporarily in the naughty corner.
What I'd do: shut up for 48 hours. Don't post. Check if those zero-view vids show "processing" or restricted analytics. Then upload one fresh clip shot and edited entirely inside the app. Skip hashtags for a couple of posts. Do not delete the dead videos yet. And if you're using business account music, double-check the licensing-that's a common culprit.
Zero views almost always means the video never entered the feed, not that people hated it. Big difference.