Welcome to the Community, @marthemarais.
You've got me here to assist you with your concern today. If you're referring to deleting your QuickBooks Online company file and start over, you can do that if the account is less than 60 days.
Please know that this option is only available for QuickBooks Online Plus and Essentials versions.
To do that:
However, if the account is more than 90 days already, you'll need to cancel it and start a new subscription.
To cancel your account:
To start a new account:
You can also check out this link attached for more details about this process: Delete your data and start over in QuickBooks Online.
I've also added here a great article that contains some help articles with negativing QBO and its features: ZA QuickBooks Help Articles.
Let me know if you're referring to something else or if you have any other concerns by leaving a reply below. I'll make sure you're all set. Thanks for coming, and have a lovely day!