You can change your account email yourself from your account settings. Your projects belong to your account, not to the email address, so they all stay with you once the change goes through.

After you save the new address, we send a confirmation link to it, valid for 20 minutes. When you open that link and get a sign-in prompt, enter your old email address, the one you sign in with now. If you enter the new address there, it creates a separate empty account and your email stays the same.

If the new address already has its own Railway account, the change can't go through to that address.