Thanks for reaching out to the Roku Community.
We understand the situation and apologize for any inconvenience caused. Unfortunately, if you do not have access to the email address associated with the Roku account, we will not be able to reset the account.
In this case, we recommend creating a new Roku account with a new email address. Once you have set up the new account, you can link your Roku device to it and continue using it as before.
You may also refer to this link: How to create a Roku account
If you have any further questions or concerns, please do not hesitate to reach out to us. We are here to help.