Ask an experienced SMM professional or marketer working in any social network whether you need to create a content plan for publications.
And believe me, no one will tell you that you can do without it. By posting randomly and thoughtlessly, you will still make your account popular and start bringing in leads through it.
This is also true for TikTok. Despite the fact that this young site plays by its own rules, the basic approaches to promotion in social networks are still the same.