disable email

check out this plugin: https://www.ads-software.com/plugins/manage-notification-emails/

Once you find a solution please tag the thread completed.

Without plugin is it possible?
I am.already using sucuri and wordfence plugin.

you can setting wordfence in notification tab

I could not find these alerts.

WordFence does not actually disable both of the notifications you are looking to disable. I’ve tried that before for one of my clients.

This thread on Stack Exchange will help you for the new user emails.
https://wordpress.stackexchange.com/questions/90311/turn-off-admin-emails-for-new-user-registrations

This article will help you accomplish the same for the password emails.
https://www.wpbeginner.com/wp-tutorials/how-to-disable-lostchanged-password-emails-in-wordpress/

Hope this helps. Once you find a solution please tag the thread completed.