I need to remove some of my invoices, all my payments, and my banks account. how can I do it?

I would consider 2 options:

First option

Utilize the trial period of 3rd party deleter tool

https://transactionpro.grsm.io/qbo

https://partners.saasant.com/affiliate/idevaffiliate.php?id=5051_2

Second option

1. Open a new account

https://quickbooks.grsm.io/Canada

2. Utilize the Copy feature to migrate the data between 2 accounts. Don't forget to utilize the backup tool feature as your insurance prior to do anything (including in First Option)

https://www.chronobooks.com#_r_chrono

Happy exploring!