Disable the /blog route
You can do this with hook_menu_alter() in a custom module or theme, for example using the following code.

function custom_module_menu_alter(&amp;$items) {
  unset($items['blog']);
  unset($items['blog/%user_uid_optional']);
  unset($items['blog/%user/feed']);
  unset($items['blog/feed']);
  return $items;
}


Make sure to clear the cache.