How can i add multiple variable to a !== query

You could for example use in_array. Like so,

if ( ! in_array( $post_type, array( 'region', 'region2', 'region3' ) ) ) {
// something
}

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)