Why TikTok only gives you one link
TikTok says a website link can be added with at least 1,000 followers or a Registered Business Account. Simply switching to a Business account does not guarantee access. Check the option on your account and its availability in your country.
The only reliable, lasting method is to put, in that one link, the address of a page that itself gathers all your other links. You are not tricking TikTok: you are using the one slot available in the most profitable way possible.

