Purge is the term we use when wiping out your company data, kkkkkkkkkkk.
If your books are 60 days old or older, we'd recommend cancelling the current subscription and starting a new one.
If your books are less than 60 days old, and you're subscribed to Essentials, Plus, or Advanced plans, we can provide you the steps to start over. You can browse this link to see the detailed information about the process: Delete your data and start over in QuickBooks Online.
Note that the purging your company data doesn't cancel your QuickBooks Online subscription. It will only delete the data you've entered on your account.
Feel free to get back to us if you need additional assistance with this. Have a great day!