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I'll help you start over again, Icaboneamy.
You can purge your company if your account is less than 60 days. I'll guide you on how to delete your data:
Purging a company file will not affect the other data.
Although, if your account is more than 60 days already, you'll have to cancel your account. Then, start a new one.
Regarding the number of accounts, it could be you're added as a user to a different account. That could be the reason why you can see a lot of companies.
Get back to us if you have more questions. We're here to assist you.