How can i access my quickbook files if i have forgotten my password?

Have you tried to reset it?

https://quickbooks.intuit.com/learn-support/en-ca/help-article/account-management/get-help-sign-quickbooks-online-account/L389eWYin_CA_en_CA?uid=lpq9wpkr

Welcome to the QuickBooks Community, darryl-guimond-l.

I appreciate you reaching out to us here. If you're still unable to reset your password after following the steps in the article provided above, I recommend reaching out to the support team outside of the Community for further assistance. They'll be able to verify your account details in a secure setting, as well as view your screen to better assist you. You can reach them by following one of these methods:

Schedule a Callback or start a Chat: select (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > then hit Let's Talk > choose Get a callback or Start a Chat.

If you have any other questions, feel free to reach out here.