One approach could be forcefully setting 404 status for single post. Please check following example. In case of singular post, query status is set to 404.
function theme_slug_customize_single_post() {
if ( is_singular( 'post' ) ) {
global $wp_query;
$wp_query->set_404();
status_header(404);
}
}
add_action( 'wp', 'theme_slug_customize_single_post' );
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