There are two ways to access your account, through your email address associated to your Noice account or through your linked Discord account.
If you have lost access to your email, you will need to contact your email provider and seek support to resolve the access issue.
If you have lost access to your Discord account, you will need to reach out to Discord support so they can assist you with recovering your account.
If you want to change the linked Discord account, please see the "How to connect and disconnect your Discord account to Noice" article.