I have encountered this problem, so I will. I put the specific methods and processes below, hoping to help you.

1. Open my Tik Tok personal page and select the third one in the upper right corner, as shown:

2. Select Settings in the menu bar below, as shown:

3. After entering the settings, select Account and Security, as shown:

4. Then click the bottom to cancel the account, as shown:

5. Then select Next, as shown:

6. Click here to confirm the cancellation, as shown:

7. Select the reason for canceling the account, click the confirmation option and cancel, as shown in figure:

8. Finally, choose to cancel the account, as shown:

So Tik Tok's account was successfully cancelled.

If you have other methods, please leave a message in the comments section below.