How to use two meta_compare in an array?

Ok so this way is a bit long but it will get the job done.

We can use multiple meta_value checks with AND relation

// get posts
$posts = get_posts(array(
    'post_type'      => 'post',
    'posts_per_page' => 150,
    'meta_query'     => array(
        'relation' => 'AND',
        array(
            'key'     => 'usp-custom-1',
            'value'   => 'question',
            'compare' => '!=',
        ),
        array(
            'key'     => 'usp-custom-1',
            'value'   => 'money',
            'compare' => '!=',
        ),
        array(
            'key'     => 'usp-custom-1',
            'value'   => 'health',
            'compare' => '!=',
        ),
        array(
            'key'     => 'usp-custom-1',
            'value'   => 'relationships',
            'compare' => '!=',
        ),
    ),
    'author' =>  $_GET["id"],
    'order'  => 'DESC'
));

You need to check the performance hit for this query because it can be resouce heavy.

I alos noticed $_GET["id"], you passed it raw, I would suggest sanitizing/validating every value that was passed to you (values that you did not pass yourself, like user input or url queries).

By the property name I assume that it will be a id, so we can sanitize it like this

'author' => filter_input(INPUT_GET, 'id', FILTER_SANITIZE_NUMBER_INT)

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