There are actually four basic types of videos on TikTok.
If you just MASTER A SPECIFIC TYPE, your stuff might go viral.
First, it can appeal to people's fear.
These are conspiracy-type or discovery-type TikToks.
You can also appeal to curiosity and a sense of surprise.
So basically, any kind of STRONG EMOTION where you have an initial hook that summarizes what you're going to talk about, and then you string along the viewer every few seconds with suspense, fear, threat, that kind of thing.
There's a lot more psychology going on in the three minutes of a high-quality TikTok video than people care to realize.