Hi @rpradana ,
You can look at using Actions to achieve this.
Email MFA works slightly differently, whereby users are enrolled in email MFA when they Verify their Email.
If you want to provide the choice to users to use one or the other on their next login, you’ll need to look at using a new feature that arrives soon that would allow you to trigger email MFA or provide user with the choice - Customize MFA Selection in New Universal Login (Currently in limited EA), this should be moving to GA soon so please keep an eye on the Auth0 Changelog