If you've lost access to your email account, refer here: How to recover access to a Hostinger without having access to the currently linked email account 💡
You can easily change your Hostinger account email address. Once you're logged in to your Hostinger account, click on the profile icon in the top-right and choose the Account Information option:
Once there, scroll down to the Account settings section and click on the Email field:
Enter your new email address and click on Continue. Next, confirm by entering your password.
Once the change is applied, you will be requested to verify it via email or your two-factor authentication method if enabled.
NOTE
If you need to change your domain's contact information (e.g., to move a domain between Hostinger accounts), follow this guide instead: How to change domain contact details