If you post videos and want more people to spend more time watching them, then you and TikTok have a common goal. That's why I cringe a bit when I see people talking about hacking the TikTok algorithm for more likes and views.
You don't need to trick it; you just need to know how the TikTok algorithm works. Once you understand its basic principles, you'll know what and when to post for your best shot at TikTok virality.