Why not create a new menu item as a custom link? Just go to yousite-com/wp-admin/nav-menus.php, choose primary menu and add a new menu item (custom link).
The link should be – yoursite-com/wp-admin/post-new.php and name as per your wish
FYI – I am not official support here, I am only a user. Just sharing what I would do if I had to do it.
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